forgot to include this link earlier.. it seems an explanation over the principles isn't need anymore.
.45cents an led
, thats where i load up on mine.
there's usually some confusion over the MCD rating of leds. most lights are rated in their Lumen output, but leds since they incredibly low power use a different scale - milli candela. there's no direct, conversion from lumen to milli candela. the scale is 1candela is equal to the same light out put of a candle. milli is a number scale meant to show the thousandths (.00x) decimal place. so those blue leds are 5900mcd = 5.9 candelas about 6times brighter than 1 candle. i usually suggest 5 leds per 4 feet of tank (lengh of tank) for moonlights. the white leds they sell (the 12,000 mcd) are ridiculously bright, you can't even look anywhere near the led
as its too bright. i was playing around with 3 of them, and they were bright enough to illuminate my entire 2 car garage, not bright enough to do work, but bright enough to identify everything in the garage.
pretty much all regular 5mm leds or smaller have a 30degree light emitting area, what that means is you will get the 'spotlight' effect on your gravel, sand, etc. i usually go to homedepot and buy some fluorescent light diffusion panels (opaque plastic that diffuses light) and that eliminates the problem, if you don't like the effect. i personally like it especially when you have built a reef layout with caves, and aim the leds to showcase those areas, or other high traffic spots.
if you guys happen to have questions on electronics, let me know i will help you out where i can.
someone a while back mentioned something about gluing leds in place, i find hot glue works the best. i will drill a hole about 1/8 to small and the bottom lip of the led
will rest on the top of the hole, and i will apply the hot glue over the base of the led
, and its leads. it doesn't conduct electricity, and is non toxic so you shouldn't have any problems using it. just remember to cover any exposed leads/wire with liquid electrical tape (or more hot glue) just to reduce any potential problems.