........ I do apologise if it looks like I'm flogging a dead horse, this will be my last instructable on growing things with LED's.....honest.
I haven't found any commercial units that use high power LED's (then again i haven't really looked, and I like to maintain the illusion I'm being original :) ), so i figure this is probably different enough from my other attempts to be worth posting.
I probably better say that you really shouldn't be attempting this unless you have a sound knowledge of electronics and have experience working with mains electricity. Also there will be high voltage near a damp environment, which is generally not the best of ideas.
It also uses really bright light, and can probably do nasty things to your eyes if you stare at it, then again if you can read this you probably don't spend so much time staring at the sun/bright objects, so hopefully common sense will prevail.
Basically be safe, and don't attempt this unless you are positive you know exactly what you are doing.
Step 1: Parts
1x Large Tub.
1x High current 5v/10v supply.
4x 3w high power red LED.
1x 3w high power blue LED.
2x STP36NF06L MOSFET.
2x 100K 0.25W resistor.
2x 0.47R 3W resistor.
1x Aluminium Box.
1x Mains Lead.
Step 2: Theory
Plants are green, therefore they reflect green light, which means they don't use it for photosynthesis or anything else they might do.
If we grow plants under only red and blue lights (they colours being absorbed), then we aren't wasting energy by producing green light. Which means not only is energy and money being saved, but it looks like the plants are having a disco too. Do you really need any other reason to build this!?
This all may or may not be better explained here: