Solar lights operate with LED as their light source since it requires less watts to make the same amount of brightness as an incandescent bulb. The light emitted from the LED is measured in lumens and the higher the lumens, the brighter the light is.
LEDs have a higher color rendering index and therefore, the clarity is better with LED lumens when compared to fluorescent, incandescent or halogen lumens. Solar lights come with a wide range of lumens depending on the lighting applications.
Lux (Illuminance) is a measurement of the light intensity at any point. It is equal to 1 Lumen per square meter. In solar street light, it is difficult to give you exact LUX because of spread on light. It also depends on the height of installation and with each angle LUX changes.
How to measure the Lux for a light?
In photometry, Lux is a measure of the intensity of light visible to the human eye. A light meter is used to measure the amount of light distributed over a particular area at a specified distance from the light source. The units that a light meter will measures in are either Lux, lumens and/or foot candle.
Below is the calculation for a 20 Watt Solar Street Light:
Solar street lights are used for both private and public lighting needs and the Lux and Lumens may vary depending on where the lights are being installed and what the lighting requirements are. All in one solar street lights are mostly placed in residential areas or any private spaces and they are available in 1100 lumens onwards. Solar street lights used for public lighting such as highways, streets, building perimeters, etc., have lumens ranging from 2400 to 18,000.
LED lights go through lumen depreciation over time and gradually get dimmer instead of burning out. Since there are no heating filaments used to produce light, LED lights do not overheat and also emit no ultraviolet rays. LED lights have an approximate working period of 50,000 hours and require no maintenance or replacement before they reach the end of their usable life.