Two 5500K lamps - one new, one old
One 5500K - one 20,000K
One 6500K Iwakasak (non R) - one 20,000K
Three 5500K
20,000K - 5500K - 20,000K
5500K - 20,000K - 5500K
we have decided on the last combo as being the most visually pleasing. the animals seem to do fine either way. each of these 400W setups cost us in the $200 range complete with lamp, and in addition to the MH there is only 40W of NO actinic for the dawn dusk effect.
hope this is of interest to some. shane