These are the LED
Blue 913LB7C ( $0.25 each) Color:Blue; wavelength-nm:470; typ-vf:3.4; max-vf:4; half-intensity- angle : 110~130°; lv-at-XXma-mcd:770~1300/(150~250)@ 50
Warm White 3000K+ 913MWO4C ($0.35 each Color:Warm White 3000K+; wavelength-nm:---; typ-vf:3.4; max-vf:4; half-intensity-angle:110~130°; lv-at-XXma-mcd:4700~7800/(900~1500)@ 50
Used the blue's 2 to 1 over the warm white. Didn't like the normal white too harsh. Needs the bit of yellow from the warm white. 6 total (4 blue , 2 w white) for the tank (36") worked fine but I went to 12 (8 blue, 4 w white) for more low intensity options. The wide angle led
's work great for the tank. Keeps the light even and diffused. The 1.5 v - 12v power supply lets me adjust the light level by adjusting the voltage from the 3v, 4.5v, 6v, 7.5v, 9v, & 12v range. Resistors are calculated for 12v supply so less v is ok.
Cost about $54. Bought more stuff than I needed. Probably could cut $15 or so off that now that I know what to do. Power supply was $20 for adjustable. Straight 12v would be about $6. Same with the resistors, jacks, wire, etc.