How many 55w PL-L lights for my orchidarium

[ChrisAZ]

I need to light an orchidarium that is 45"tall 30"wide and 20"deep. I plan on using 2 or 3 55w PL-L's with individual reflectors. Each 6500k bulb is about 4800 lumens. Can anyone give me an opinion on how many bulbs to try to pack in a custom built hood .Is 2 55's enough? Is 3 too much? Are the 6500k's the way to go? The ballasts will be mounted away from the enclosure to reduce heat and the bulbs will be fan cooled within the hood, behind glass. I'm not sure yet on exactly what all I'll grow in here yet, though I hope to be capable of a decent variety being that the light level will vary quite a bit from the top to the bottom of this 45" tall enclosure! Any suggestions?