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LumusSolem Solar Lighting FAQs

Answers to

frequent questions

LumusSolem has been focusing on solar outdoor solar lighting, which has enabled us to achieve brilliant achievements in this field.
LumusSolem solar lighting products are exported to many overseas countries and regions.
The difference between monocrystalline silicon, polycrystalline silicon and amorphous silicon.

how do we choose?


The monocrystalline silicon solar cell is the first to be introduced. Silicon is an extremely abundant element on the earth, which exists almost everywhere. It can be said that it is inexhaustible.

For using silicon to manufacture solar cells, raw materials can be said to be in abundant supply, but refining it is not easy. Therefore, in the production of monocrystalline silicon solar cells, people research and develop polycrystalline silicon solar cells and amorphous silicon solar cells. So far the commercial scale production of solar cells has not yet jumped out of the silicon series.

In fact, there are many semiconductor materials available for the manufacture of solar cells. With the development of the materials industry, solar cells will have more and more varieties. Some common solar cells are introduced as follows.

The photoelectric conversion efficiency of monocrystalline silicon solar cells is about 17% (Our company currently reaches 20%. Welcome to test), but the production cost is great. The service life is generally up to 15 years, and the highest can be up to 25 years.

The production process of polycrystalline silicon solar cells is similar to that of monocrystalline silicon solar cells, and their photoelectric conversion efficiency is now generally lower than 17%. The cost is cheaper than monocrystalline silicon solar cells. In addition, the service life of polycrystalline silicon solar cells is shorter than that of monocrystalline silicon solar cells.

Amorphous silicon solar cells recently have considerable development. Their photoelectric conversion efficiency continues to improve. The stacked cell structure improves the stability of photovoltaic cells and conversion efficiency. The use of high light transmittance film greatly improves the conversion efficiency.


It is currently the most developed type of solar cell, its composition and production process has been finalized and the product has been widely used in space and ground facilities. This type of solar cell is made from highly pure monocrystalline silicon rods with a purity requirement of 99.999%.

In order to reduce production costs, the material performance indicators of solar monocrystalline silicon rods used in solar cells in ground facilities have been relaxed. Some can also use the monocrystalline silicon rods for solar cells that are re-drawed from the top and tail materials processed by semiconductor devices and waste or inferior monocrystalline silicon materials.
The monocrystalline silicon rods are cut into slices, which are generally about 0.3 mm thick. The wafers are then shaped, polished and cleaned to produce the raw silicon wafers for processing.

To process the solar wafers, the first step is to generally incorporate and diffuse silicon wafers usually with trace amounts of boron, phosphorus, etc. Diffusion is carried out in a high-temperature diffusion furnace made of quartz tubes.

Then the screen printing method is used. The silver paste is printed on the silicon wafer to make grid lines. After sintering, the back electrode is made, and the surface with grid lines is coated with a source of reflection reduction to prevent a large number of photons from being reflected off the smooth surface of the silicon wafer. The monolithic wafers of the monocrystalline silicon solar cell are completed.

After random inspection, the monolithic wafers can be assembled into solar modules (solar panels) according to the required specifications, with series and parallel connections to form a certain output voltage and current, and finally encapsulated with frames and encapsulation materials.

Polycrystalline silicon wafers

The production of monocrystalline silicon solar cells requires a large amount of high-purity silicon materials, and the manufacturing process of these materials is complex. The electricity consumption is very large, which has exceeded one-half of the total cost of solar cell production. Moreover, the drawn monocrystalline silicon rods are cylindrical, and the solar cells made by slicing are also wafers, leading to the fact that the surface utilization rate of solar modules is low.

Therefore, since the 1980s, some countries in Europe and the United States have invested in the development of polycrystalline silicon solar cells.

Therefore, since the 1980s, some countries in Europe and the United States have invested in the development of polycrystalline silicon solar cells.

At present, most of the polycrystalline silicon materials used in solar cells are the top and tail materials for manufacturing single crystal silicon materials, which contain a large number of single crystal particles, or are made of single crystal silicon materials and metallurgical grade silicon materials by melting and casting.

The production process of polycrystalline silicon solar cells is similar to that of monocrystalline silicon solar cells, and its photoelectric conversion rate is about 15%, which is much lower than that of monocrystalline silicon solar cells. However, the materials are easy to manufacture, save power consumption, and have a lower total production cost. Therefore, it has been extensively developed.

Amorphous silicon wafers

Amorphous silicon wafer solar cells are a new type of thin-film solar cells that emerged in 1976, which are completely different from monocrystalline silicon or polycrystalline silicon solar solar cells in terms of production methods, with less silicon material consumption and much lower electricity consumption, which is very attractive.

There are various methods of manufacturing amorphous silicon solar cells, the most common being the glow discharge desposition. Amorphous silicon solar cells are thin enough to be made into stacks or manufactured using the integrated circuit method, where multiple tandem cells are made at once on a flat surface with an appropriate masking process to obtain higher voltages.

Therefore, ordinary crystalline silicon solar cells are only about 0.5 volts individually, and now amorphous silicon tandem solar cells produced in Japan up to 2.4 volts.

The current problem of amorphous silicon solar cells is the low photoelectric conversion efficiency. The international advanced level is about 10%, and is not stable enough. There is often the phenomenon of decay in conversion efficiency, so it has not been used in large quantities for large solar power, and most of them are used for low light power, such as electronic clocks and copiers.

In summary, you already know how to make a trade-off, right?

What material is the lamp?

Our lamp body is made of die-cast aluminum. As we all know, aluminum has the advantages of lightness, long life, anti-rust, anti-corrosion, etc., even if the weather is humid, it will not rust, usually it will not be corroded for more than ten years, the most important The die-cast aluminum material can increase the wind resistance, and will not be deformed by long-term wind and sun.

How many watts?

Our lamps have sufficient brightness, which can illuminate about 30-50 square meters. The product details introduce the actual brightness effect. It is recommended that the distance between 39 inches and 43 inches is a distance of one lamp, and the lighting effect is the best.

How about after-sales? How long can it be guaranteed?

All our products are guaranteed for 3 years. In case of abnormal failure or damage, you can send it back for free replacement (in the case of non-man-made damage).

Can it be waterproof? How is the waterproof performance?

The protection level of our lamps reaches the IP55 level, and generally heavy rain will not cause damage to the lamps! All products are treated with precise waterproof measures. Please use it boldly. If there is a problem, we promise a 5-year warranty.

What should I do if there is damage during transportation?

Our lamps leave the factory after vibration transportation testing, and only after reaching the standard can they leave the factory, and we will provide professional third-party inspection reports for each batch of products. The packaging is all shockproof foam + rigid carton reinforced packaging, unless it is damaged by man-made or violent transportation. Non-man-made destruction, we promise to replace new products, and bear all logistics costs.

Can it be bright on a rainy day?

When fully charged, the lamp can last 16-24 hours, so usually the battery can be bright even if it accumulates for a day or two in rainy days; our solar panels use high-spec A-level standard monocrystalline silicon solar panels, and the batteries are all new batteries. Please use it to your heart's content and enjoy life.

Will it fade?

We are a professional manufacturer of outdoor lamps. The products are processed by high-temperature baking varnish, anodizing and other processes. Usually, the color will not fade easily if there is no strong acid rain.

Will it be blown off if a typhoon blows?

Usually it is windy and heavy and rainy. Normally it is no problem to fix it properly. We can't guarantee the extra-large typhoon (destructive and severe weather).

What is the brightness of the lamp, will it be very dim or dazzling?

This brightness can be adjusted through the mobile phone app. We provide a lot of colors for consumers to adjust with their immediate mood. This is the charm of intelligence.

Can electricity be stored when there is light?

The solar lamp is light-controlled and inductive, and it needs to be exposed to the sun to store electricity. If it is cloudy or rainy, the ultraviolet rays are not strong, and the electricity storage will be less than under the bright sun. The lighting effect and the length of the light will have a relatively slight impact. We aim to upgrade the conversion rate of solar panels and the quality of the battery. Under the premise of the bright sun, the battery can be fully charged in 3.5 to 5 hours, and the ultraviolet light is relatively weak in rainy days. With the conversion rate of one day, our lamps can still last for 8 hours. . Please do not install under big trees during installation, which will affect the conversion rate of solar panels. Please allow the sun to radiate from the front as the best installation location.

Are your screws stainless steel? Will it rust in the rain?

The exposed screws of the lamps are all stainless steel screws, which will never rust, please rest assured to use, we are committed to manufacturing high-quality products.

If there is a problem with the received lamp, should I replace it or repair it?

All our products are guaranteed for 3 years. In case of abnormal failure or damage, you can send it back for free replacement (in the case of non-man-made damage).

Do I need to turn off the switch if I don't use it at ordinary times?

We all adopt the smart control of the mobile app and the memory function. The on/off time can be set in the app, and the lights will automatically turn on/off. After installation, you only need to turn on the switch. We upgraded the light-controlled sensor system, which automatically turns off the lights during the day and lights up in the sun and turns on the lights at night.

Is it better to turn off the light for sun exposure or turn on the switch?

This solar light can store electricity in the sun when it is turned on or off. It is recommended to turn on the switch to store electricity in the sun to store electricity better, so that it can automatically turn on at dark. For example, turn off the switch to store electricity in the sun. At night, you need to turn on the main switch again, which is relatively troublesome.

Q: How do solar lights work?

A: Solar-powered lighting consists of a solar panel or photovoltaic cell that collects the sun’s energy during the day and stores it in a rechargeable gel cell battery.
A solar lighting system consists of various components, including an intelligent controller that prevents the solar panel from overcharging the battery bank. It also senses when there is no longer any energy from the sun and automatically turns the LED light on using a portion of the stored energy in the rechargeable battery.

Q: What does the term renewable energy mean?

A: Renewable energy is generally defined as energy that is collected from resources that are naturally replenished, such as sunlight, wind, rain, tides, waves, and geothermal heat. Solar light’s are 100% renewable energy.

Q: What’s the advantage of Outdoor Solar Lighting?


1) Solar outdoor lights are independent of the utility grid. Hence, the operation and installation costs are minimized.
2) Solar lights require much less maintenance compared to conventional lights.
3) Since external wires are eliminated, the risk of accidents is minimized.
4) Electricity produced by solar panels is non-polluting.
5) Separate parts of a solar panel system can easily be transported.
6)Energy costs can be saved.

Q: I assume I would need an electrician to install? Is there anything special about the lights that my local electrician wouldn’t be able to handle?

A: Because our lights are not tied to the electrical grid and they’re low voltage, it’s not required to have an electrical contractor.

Q: Why are LED lights used?

A: LED lights are used because they use much less electricity to put out light. Making them much more efficient. The lower usage of electricity allows longer and brighter use generated by solar power.

Q: How long do Solar Lights Operate for?

A: With solar power being more popular than ever, it is quite easy to find fixtures that operate for as long as is needed. The average light fixture in all major categories of solar lighting (Spot, Flood, Lamp post, Security, etc.) feature an operation time of 10-12+ hours. Many commercial fixtures can even be upgraded to accommodate any required run time.

Q: How long does a solar street light stay on at night?

A: Solar street lights can work up to 6-8 hours per night. If the customer requires longer periods of illumination, the customer can opt for higher battery sizes for the street light.

Q: How does the light know when to turn on and turn off?

A: Most of the street lights have a PIR motion sensor. It detects motions up to 7.5 meters. The solar panel detects the external source of light and automatically switches on and based on the source. When the voltage drops, the lamp switches on and when the fixed working hours have passed, the light will turn off automatically.

Q: How do I know which Solar Lighting Fixture will work for me?

A: There are many things to consider when choosing a proper solar fixture. First, you want to identify what you are looking to illuminate. Do you require functional or ambient lighting? Are you looking to illuminate a focal point or a general area? Next, you need to determine what color temperature and brightness you require. These are measured in Lumens (Brightness) and Kelvin Range (Color temperature). Lastly, if you require a focal point illumination (For signs or monuments for example) or area lighting (such as a back yard or parking lot) you will want to measure the area and have a general idea as to the size of your subject matter. Once you have this information choosing the perfect fixture for your application will be a piece of cake.
With this article we kick start the newest series of FAQ blog posts. If you have any questions you would like answered, please feel free to leave a comment. Your question may even be featured in an upcoming Earthtech Products article! As always, we are just a phone call us we are happy to offer our expertise on all of your solar needs!

Q: If The Controller Of Your Solar Street Light Has Different Time Control Function?

A: Yes. For saving energy, our solar charge controller is designed with the function of different time control function, such as one-time zone, two-time zone or three-time zone, two-time zone means dividing the lighting hours into two parts, like 12 hours (6 hours full power lighting + 6 hours half power lighting.

Q: How To Know When The Solar Street Lights Are Turned On And Turned Off?

The controller we use is an intelligent waterproof controller, which is composed of a light controller and a time controller. After it is installed and set up, no man-made operation is needed. The control function in the solar lighting system is equal to people’s brain, which is connected with solar panels absorbing sunlight, storage batteries for storing energy and the lamp of lighting. When it senses the voltage of the solar panel dropping down to a certain level, it will automatically turn on the circuit of the lamp. And when the set working hours of lighting is ended, it will turn off the light automatically. Besides the function of intelligent light control switching-on and switching-off, such an intelligent controller has many other functions, such as prevent the battery from overcharge or over-discharge. 

Q: In Order To Provide The Best Solution Of Solar Lighting System For Us, What Information Are Required To Provide?


1) Detailed installation locations, we will calculate the configuration based on your local sunshine peak time.
2) Exact working hours of lights every day (such as 10 or 12 hours every day).
3) Rough consecutive rainy days (such as 1 to 3 days) are required to be guaranteed to keep the lights working normally.
4) Height of light poles or width of roads.
5) Brightness of street lights required (such as 30 watt led lamp).

Q: What are the solar system’s safety procedures in case of a problem or malfunction?

A: This depends on the intensity of the issue. Trivial malfunctions can be easily fixed through readjusting the settings, cleaning the sensor, restarting and such. While cases of more serious nature would require a more knowledgeable person. This includes clogged lamps, flickering lights, faulty or damaged.

Q: How long can my solar street lights operate without sunlight?

A: Our high-quality solar street lights ensure that the level of operation doesn’t diminish during conditions where there is a lack of sunlight. They come with efficient battery power to store energy and function without charge for 4 to 5 consecutive days.

Q: How long does each system last:

A: Each component of a sol system has a different lifespan:
1) Solar panels: up to 20 year
2) Batteries: approx. 5 years
3) LED Fixtures: approx..50,000-10,000 hours
4) Electronics: approx.5 years

Q: How often will a solar light need to be maintained?

A: Solar-powered outdoor lighting is virtually maintenance free, since the batteries require no regular service. With every EverGen system you receive a complementary 12-month subscription to Sol’s Insight remote monitoring platform. This platform uses GPS to pinpoint system faults and notifies you of the location via alerts sent to your dashboard. A 10-year warranty comes standard with every EverGen light, and also includes a 5-year battery warranty. An extended-life 10-year battery upgrade is available. Extended subscription.

Q: Can I use my solar lights in the winter?

A: You most certainly can. Due to shorter daylight hours in the winter time you may see shorter run times. However, as long as the fixtures are receiving enough direct sunlight (6-8 hours), you will still see similar operation. Many solar fixtures feature a “low power” option designed specifically for low light and winter month conditions.

Q: If There Are Several Consecutive Rainy Days Occurring, What Shall We Do? Can It Be Working Normally?

A: You don’t need to worry about it. We have taken it into our consideration. You can advise us of the specification with the consecutive rainy days which needs to be guaranteed. If you don’t have a clear need for that, we will recommend to you the local regular consecutive rainy days.

Q: Will the solar lights still work if it’s cloudy?

A: Sol’s lights work even after cloudy days. During daylight, even when overcast, the solar panels continue to charge the batteries, and the system is designed to work for at least four days with no sun! ( This is what we refer to as the autonomy of the system. Four days in what we consider to be industry standard)

Q: I live in a strong wind zone - is your solar lights strong enough to withstand high winds?

A: Yes, most of our systems are designed for 145 mph winds.  In hurricane zones we’ve created systems that can handle winds up to 180 mph.

Q: What's The Sunshine Peak Time?

A: The sunshine peak time refers to the unit strength of the sunlight reaching the earth every hour. Only strong intensity of the sunlight can be absorbed and converted. That’s to say, it is measured at noon, within 3-4 hours before and after noon (depend on different location). During that time the charging effect of the solar panel is the best.

Q: I’m in an area where we would like the lights to dim late night and come back to full brightness before sunrise - is this possible?

A: Yes, our systems are completely programmable to come on for a predetermined amount of hours after sunset and if needed come back to full brightness before sunrise.

Q: How to install solar light?

A:The installation of our street lights are very simple and wouldn’t require you to rack your brains. For installing integrated solar street lights first you need to set up and fix the pole. Each light is mounted on a standard galvanised pipe concreted in the ground or other similar poles depending on aesthetic or standards requirements. Depends on the location a pole with 3-5 meters long is appropriated.
Then put the integrated solar light into the pole, fasten the screws with the screwdrivers and switch the light. All lighting should comply with any Council outdoor lighting rules.

Q: What All Should Be Considered Before The Installation Of A Solar Street Light?

A: It would be ideal to place the solar panel under direct sunlight and away from any kind of shade.
1) If possible, the solar panel should be placed away from over-hanging trees and other hindrances.
2) Charge the lamp for a minimum of 10-12 hours initially for best results.
3) Keep the solar panel away from other artificial lights as the sensor may not be able to differentiate day from dusk to night.

Q: What kind of maintenance should be done on solar street lights?

A: Our lighting system is maintenance free. The rain usually keeps the panels fairly clean.  If in an area where snow gets heavy, you may need to brush off the solar panels. However, given the solar panel’s angle, snow usually slides right off once the sun rises and the temperature goes up.

Q: How do I take care of my outdoor solar lighting?

A: Because solar lights are powered by direct sunlight, they need to be cleaned periodically from dust or mud, so they can easily store energy for the night. They also do not work as well during the winter or on cloudy days, so you may want to store your them indoors during rainy or snowy seasons. Switch them to the off position when they are not being used and store them in a dark place.

Q: How should I clean the solar panel, if required?

A: The solar panels are low maintenance. Usually, the dust accumulated on these panels is washed off by rain.

Q: How often do I have to replace the batteries?

A: There are different factors and variables that go into the life of your batteries, on average the batteries will last 3 to 4 years up to 10 years without any problems.

Q: How long do the lights last before I have to replace them?

A: Our state of the art LED floodlights have a life long warranty. If there are any problems with your light please contact us and we will make sure to get you new lights.

Q: How To Maintain The Solar System?

A: It doesn’t need to be maintained too much. It is very convenient to use. Only if the surface of the solar panel should be cleaned every 3-5 months if the local place has too much dust. Therefore it can keep high efficiency.

Q: If the Solar Fixture stopped illuminating, what may be causing this?

A: The most common cause of a drop-in performance is lack of sunlight due to poor weather. If you had less than normal sunlight hours, simply turn your fixture to the “Off” position and allow it to recharge for 2-3 Sunny days. This will allow that internal battery to fully recharge and operate as normal. If this does not provide a solution, you may need to replace the battery. Most solar fixtures will require a replacement battery after 1-3 years from date of purchase.

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