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Artificial sunlight (PLANT GROW LIGHT) 
We can use light from LED instead of light from the sun To help plants grow or photosynthesize. Why is that? First of all, we need to know the Color Spectrum, Wavelength of various types of light, what components they contain and which ones are necessary. Some tree growth
 

        Sunlight consists of every Color Spectrum, just like when we shine light through a prism or when a rainbow occurs in the sky. Each color of light has a different wavelength. With the growth of trees, there is actually only red light and blue light. Yellow, orange, and green are not necessary because they will all be reflected back.

The light that is closest to sunlight is the light from Incandescent bulbs or incandescent bulbs. But we can use 80-85% red LEDs and 15-20% blue LEDs together to create light with the wavelengths that plants need. Sun is suitable for use with ornamental plants grown indoors. or hydroponic planting.

Color Spectrum The above belongs to the Fluorescent tube. You will notice that there is no spectrum of any colored light at all. Therefore, it does not work if we place the plant in the shade with only light from the bulb. Florescent. The right side is the Color Spectrum of incandescent bulbs. It can be seen that it is closest to sunlight or sunlight. But it consumes more power if compared to LED.

Now let's take a look at the Color Spectrum of the LEDs. From the left is the spectrum of blue LEDs, next is the red LED and on the far right is the white LED. We put them all together to produce light like the light from the sun. Most likely, we should add a little white LED to have a Color Spectrum of yellow, orange, and green as well. Suppose we will use a total of 100 LEDs, which is 80 red, 19 blue, and 1 white.   Red 80%, Blue 19%, White 1% or don't use white at all.
                
      

The reason why LEDs can do this is because normally electrons that are electrical energy can be changed back to light energy which is called Photons at different wavelengths and frequencies As a result, the colors come out differently according to the principles of Quantum Physic. 

DIY LED PLANT GROW LIGHT

Now we will create artificial sunlight for the plants. In the case that some plants require quite a lot of sunlight, but in this work we will not use incandescent bulbs. We will use LED bulbs instead because they are more energy efficient. Using red and blue bulbs in a ratio of 4:1, that is, 4 red bulbs, 1 blue bulb, as a percentage, 80% red, 20% blue. You can add 1% white to get as close to sunlight as possible.

Source: http://kasettakonhitech.blogspot.com/2015/04/plant-grow-light.html#sthash.yJahCUro.dpuf