MegaBrite installation
I replaced the LED nightlight in our bathroom with a MegaBrite.
I got some plastic domes on eBay. Do you want one? I have several extras.
I attached the dome to the ceiling by tying some bicycle tire around pushpins that press out against the inside of the dome. Here are a few other uses for old bike tubes.


Here are some unretouched photos of the MB with its dome lighting up the bathroom. Shutter times are 1/2 and 1 sec.

When I was testing the MegaBrite, it was hanging down from the ceiling and I happened to have a glass of water nearby:

The first two pictures are from different positions of the MB in the glass; in the third one I am sloshing around the water:

I'm controlling the MegaBrite with a parallel port, which is very simple to do. I'm getting LED power from the 5V rail of an old computer power supply. The power is going over perhaps 50 feet of cat5 which probably adds a lot of resistance. I measure 4.7V at the MB end (with the MB turned on). The parport control code is here. It has no attempt at optimization yet, and I think it takes just under 1ms to do a single update. If I add more MBs to this chain I may need to fix the inner loop in that code.
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