12-01-2010, 12:21 AM
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Yes the common little (5mm) are crap for growing plants, for various reason. When using LED's to grow plants, super high powered 3 watt LEDs are used. These things are a whole different ball game then little LEDs. They are powered differently, produce considerable amount of heat, are expensive, and some other stuff.
Honestly, no insult intended, but I don't feel this is a good way to go. $12 for LED moonlights is expensive to me. IDK what size tank you are lighting either or how bright it really is in person. For me a 15 gallon tank(2x1x1) took 4 good quality component LEDs to light it. Wire is cheap to come by in this house. The 5mm LEDs themselves costed 60 cents. Then maybe a dollar for resistors and $5 for a decent phone charger to run them off of. Then its just some time, tape, and know-how. IMO anytank deeper then 1 foot or longer then 30" you should just use cold cathodes. Adjustable cold cathode moonlighting on my 55gallon costed $17 maximum, requires less work then the LEDs, but still need to splice and connect a couple wires.