I wouldn't use a blacklight... UV light is harmful to all living things.
Some flowers and fruits appear to grow better with UV exposure, but it's actually 'stressing' the plant which makes it flower.
Lemme guess- you have glow fish?
A Moon light should make them glow without quite as much UV.
Originally Posted by Aqua Jon
And for clarity, red is the most active color for human perception because it causes the most vibration of the cones embedded within the retina of the eye.
Most of your post is spot on, except for the clarity portion...
Red doesn't appear more vibrant, but it does create more vibration. Red light simply has more energy than blue light.
Or were you thinking that Red cones send more energy to the brain? If so, you're right... The cones that register greenish yellow, with wavelengths around 564 nm are called 'red cones'.
Byron Thanks for the lovely pics.
It's all very confusing... Plants will suffer and die without red spectrum light... But they don't need much since red light carries a lot of energy.. Plant growth LED fixtures (for terrestrial plants) show this, since they usually have blue and red LEDs in a 7:1 (or more) ratio. We still don't know what other spectrums do...
Green tends to make terrestrial plants grow taller, by triggering stretching... Some plants this is good (lettuce), some plants this is bad (fruit-producing plants)...