LiquidShaneo
Reefer
I would say any bulb that is lower in kelvin would work just fine as the lower K bulbs put out more red light than the higher K bulbs. Plus it would be less expensive bulb-wise as low K bulbs are really inexpensive. If it were me, I'd stick somewhere around 3000 K to 4000 K... However, I have also been toying around w/ getting a LOA #9266 outdoor floodlight to try it out on a mocked up version of an ATS as well and according to the mfg it's 6500 K. I may opt for the MV or HPS lights tho as they are more of an industry standard bulb than the LOA model.
Shane (aka 'liquid')
Shane (aka 'liquid')