Hi KM.
I'm using the built in 3ds max light explorer with max 2015 and the light intensities are a little screwy to say the least. I wanted to find away to control lights and seeing as the light lister is broken for the daily builds I found max had it's own.
Anyway, see screen-shot of problem values.
Notes about the screen-shot.
CoronaLight005 has 0.0 as it's intensity. The other values or corona lights are normal 40watt equivalent values or thereabouts.
Omni001 has a normal multiplier value of 2.11 like the explorer shows.
VRayLight001 has 3804.3303 as its multiplier.
For the VRayLight001 the value changes depending on the units used. lumens, watts etc.
Looks like corona isn't sending the values to max or something. And those values are some sort of internal measurement as they don't change when you change the units used.
Create a few Standard lights, corona lights and even vray lights and you'll see what I mean. Light color works okay.
BTW. Anyone unsure how to get to the light explorer in max see the other screenshot. 2015 only.