Target illumination LEDs - What color? How bright?

[adamdb]

For those using LEDs with the Axis camera to illuminate the target, what color works best and how bright do they have to be? A quick perusal of Ebay shows a wide range of colors with brightnesses from 5000mcd to 20000mcd. Do some colors work better than others? Would twenty 5000mcd LEDs work as well as ten 10000mcd LEDs? Do we even need the LEDs? I have seen some teams using the Axis camera without them.

For those that are using LEDs, did you buy a pre-made widget with the LEDs already on it or build your own from individual LEDs? How many LEDs or what total brightness should we be looking for?

Just looking for some data, anecdotal or measured.

Thanks