What is the effect of colored light bulbs on plants growth?

Answer 1

Firstly, plants take in light depending on what colour it is. If it's green, it will just bounce right back off of the plant (This is because we see because of light of different colours reflecting off objects and our eyes receiving the light, which also explains why we can't see in absoloute dark)

The following a listed worst colour to use to best colour to use.

Plants don't like yellow. I'm not entirely sure why but I'm assuming it's because it's the main colour in green. So a plant with yellow light will either die as soon as they come out of the ground or grow about 2 inches before dying.

Plants don't like green either, but not as much as yellow for some reason.

Blue is the second best of all the colours to use. I'm also not sure about this, but I'm assuming it's because it's the minor colour in green.

Reds actually the best, since it in fact has (Almost) NOTHING to do with green at all.

However, it's best not to use cellophane and just leave it out in the sun if you're going to do an experiment with this like I did. It magnifies the light, thus burning the leaves slightly. I recommend simply using a coloured light bulb in a box.

Oh and all of that's only relevant if it's a green plant, by the way. If it's a reddy purple then I wouldn't expect red to turn up the best.

If the plant is any other color than green the colors of the light will have a totally different effect on the growth of the plant

Originally by some random person who thought red made plants die because it was too hot, then corrected by Dara Mac Eoin (No, not my full name, don't ask what my full name is) And then edited by Ben Schloss, who, if I hadn't edited this last part, would've got away with 100% of the credit

Answer 2

The polychromatic light will be changed into monochromatic light due to the reflection of particular color of the bulbs hence the plant growth will be affected accordingly.