choices among fluorescent bulb types
I'm growing orchids (generally low light tolerant) under fluorescents in a dedicated grow-room, no daylight infiltration. I read in this forum and in books that folks can go the 'cheap' route with the popular tubes, or perhaps get some advantage using the far more expensive specialist tubes. Since all are supposed to be replaced in 6 months to a year or so, I have incentive to go with the former.
Most available to me at Home Depot are Philips cool white 'plus' (plus what?), Philips soft white (replacement for their warm white and kitchen and bath), Philips daylight. Then they have some oddballs like the Ott light and Philips plant and aquarium - both supposedly designed for growing plants and costing 3x or more the common types. I've got the impression that the warm white/soft white, at 3000k, can supply some of the needed red wavelengths and that cool white or daylight supplies some of the blue wavelengths. The much higher color temperature of the daylight bulbs has me wondering which would be superior, wattage and nominal lumens otherwise being equal. I'd appreciate any input.