JProx
Aquarium Advice Freak
lol well radioshaft wants 4bucks an led, lsdiodes is like 400times cheaper than radioshack, you will get you're leds from them next week, mid week i will bet. they are pretty fast shippers. i know your joking (at least i hope you are) but that entire sub fixture with a reflector is totally not neccessary. leds push close to 80% of the light through their tip, which means only a small % is actually escaping from the backside, so going through the pain of installing a reflector to gain 10% extra light (led's are not 100% effecient, they are pretty close though) is pretty much a waste
what i did for my 12gal eclipse tank, was grab some scrap 3/4(width) plywood, cut to fit (and boy was that a P.I.T.A) polyurthaned it, then drilled 5 holes, counter sinked them so the leds would fit inside the wood, the soldered wires to the legs, filled the top section of the countersink with aquarium sealent (to prevent water from entering there) ran the wire through the holes, installed the resistors on the top of the wood, soldered all the wires together, then ran them out of the tank, and to the dc adapter. it's really simple and i will take some pics if you want.
i was just doing some math, and i believe your 130ohm resistor choice is bit off.
9v source - 4v required voltage = 5v / 20mA = 250ohms, so you should pick something between 250 - 300 ohms, to be on the safer side.
what i did for my 12gal eclipse tank, was grab some scrap 3/4(width) plywood, cut to fit (and boy was that a P.I.T.A) polyurthaned it, then drilled 5 holes, counter sinked them so the leds would fit inside the wood, the soldered wires to the legs, filled the top section of the countersink with aquarium sealent (to prevent water from entering there) ran the wire through the holes, installed the resistors on the top of the wood, soldered all the wires together, then ran them out of the tank, and to the dc adapter. it's really simple and i will take some pics if you want.
i was just doing some math, and i believe your 130ohm resistor choice is bit off.
9v source - 4v required voltage = 5v / 20mA = 250ohms, so you should pick something between 250 - 300 ohms, to be on the safer side.