Got done with my rocklight LED project this weekend, I think I've been working on this off and on for about a year now. These are the same type of 1 watt LEDs used by roundeyes, but I only have about $35 into all 8 LEDs. I won't be posting how to make these out of respect for roundeyes, but if you have a little knowledge of electronics, how LEDs work and do a little internet research, you can figure it out. However, if we happen to meet at the campfire, I'd be glad to tell you.
BTW, my driver circuitry is far from efficient (I never did like EE), but it works well enough. Combined, all 8 only draw 1.4 amps.
Originally, I was going to just slather liquid electrical tape over the circuit board where the wires are soldered on. I changed my mind and mounted them in epoxy, but I think it would have worked.