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Purple light is not what you want, what matters is the amount of light, not the color of it. Any colors except cheap white ones put out less photons.
Are they hot enough? They are used to being at 80F+, dry and well lit.
What you have there is good for ferns.
Q: hmm, what's the purple light for then?
It makes people buy them.
It's an interesting phenomenon. In 1970 two guys in Ohio published "Lighting for plant growth" (Kent State Press, 1970) and looked out two photosynthetic pigments, Chlor-A and Chlor-B. These respond to 275nm nd 280nm as spectral peaks red and blue.
They were funded by GE then works with Phillips to develop "Grow Lux" bulbs that put out 900 lumens of purple light compared to 2200 for warm white/cool white.
This is the sole source of the purple light myth*
The other fluorescent tube manufacturers followed suit, then all came out with "wide spectrum grow lux".
The problem is in the real works warm white grows plants better.
The problems with their study is they used one plant and looked at two pigments. There are at least 30 and they cover the entire spectrum. We wasted decides on this silliness, not to mention a huge amount of money.
There is no such thing as a fancy color light source that works better than the cheap bright ones.
Think about the physics of it. Say 2200 lumens or photos hit a plant compared to 800 that happen to be purple. Plants cant see purple, they just do something even trying a photon hits them and trh more the better. They don't care what frequency they're at which is all color is.
*Not to be confused with the blue bulb myth, the mistaken believe blue headlight bulbs let you see better at night, they do not, amber ones do, in fact in inclement weather blue light cuts down visibility because it's short wave is scattered most by fog, amber (required in France) is the opposite. Why do people want blue HID lamps? So their friends know they spent the money. The can make then in white, nobody wants them. I wish I was making this up. Source: Dan Stern/NHTSA Lighting standards guru.
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