I really like the bulb but wanted more actinic for color and night time viewing. I decided to add some CREE LED bulbs from RapidLED and design a custom ring for the Par38 bulb that hangs over my tank.
Here is the ring with a few bulbs attached so far. I had it waterjetted out of aluminum. I was going to anodize or paint it black but I decided I liked the silvery look.
Here is a closeup of the bulb and heatsink sandwich. I used thermal grease in between all of the metal parts for heat conductivity. It runs quite cool, I actually think the fins were overkill, but they look neat.
Test fitting on the back of the Par38 bulb. The ring just rests on the ledge of the par 38 bulb. I removed the shield from my light because I was a little worried about all that LED heat building up under there.
Now the bulbs are all mounted, and soldered together, and the 60deg lenses are installed with a little thermal epoxy. Btw, if you're doing this, dont use superglue to adhere the lenses - I hear it can cloud the lens surface when curing.
And here they are running..!
I used a LED driver that allowed me to use my reefkeeper system to adjust the intensity, but the RK module is quite expensive. For now I am using a radio shack power supply with adjustable voltage ranges to control the brightness. Its quite hard to photograph the tank with all that blue, so I gave up. It does a great job of bringing out the colors and with the main light off, the tank looks amazing. I'm seeing colors I never saw before.
I tried using some UV lights and even a natural white bulb on the ring before I went all blue, but the white lit up the tank too much and negated the blues, and the UV didn't seem to make a difference, and since they are new, there are no lenses available for them, so I took them off so the ring looked more concise.