Okay, looking around a little more, I see see sparkfun sells this darlington array made to switch loads, LEDs, relays @ 500 mA per channel. It's the ULN2803A
...so this soic chip looks to do the same. One chip will do all three of my lights (they'll be LEDs, not tungsten, but that info about tungsten lamps is something I didn't know).
It's the ULN2003A
I'll be driving it with an UNO @ 5 volts, or an ATtiny85 @ 5 volts
Does this chip look like a good choice?