How to choose a reliable LED grow light ?-Part two
3. Light efficiency
Light efficiency is an important indicator for considering a lamp. Light efficiency can also be understood as the photoelectric conversion rate, which is the ability of a lamp to convert the input electric power into light quantum. When the same 100W electrical power is input, the light quanta output by different lamps is different, ranging from high to low.
There are many factors affecting light efficiency, which are related to the overall design of a luminaire, because the electrical power is lost after each conversion in the luminaire. Can be summarized into the following four main factors:
1) First of all, from the most basic LED chips, different brands of chips themselves have different luminous efficiency, so choosing a chip with high light efficiency is the basis for a qualified product.
2) Secondly, the driver assumes the role of linking up and down in the lamp, and converts the input power into the power required for the LED to work. There will also be corresponding losses, so it is especially important to choose a high-efficiency supporting drive.
3) Again, optical design needs to be taken into account. Because a luminaire will be equipped with a reflector or lens, the excellent optical design will help provide light effects.
4) In addition, if the product needs additional auxiliary cooling (air-cooled, water-cooled), this additional auxiliary equipment will also affect the light efficiency. Because part of the input power needs to be allocated to the auxiliary heat dissipation work, not all of it is provided to the lamp for lighting use, which ultimately leads to a reduction in light efficiency.
Finally, after considering the loss caused by all the above parts, the real light terminal efficiency is obtained. This is the parameter we really need to consider. Instead of comparing the light effects of one part or unequal comparison of different parts.
