Those fluorescent fixtures are doing a great job, Bill. Generally, when it comes to commercial growing, the 6500K are used for vegetative growth. I am surprised you are getting so much budding. The 2500-4000K are used in the nursery industry to initiate budding/blooming. Here again is an excellent example that given good, bright light, orchids (and other plants) can flourish, regardless of Kelvin range.
That being said, you refer to your 6500K as "full spectrum", which is actually related to sunlight. 6500K is only a part of the range of Kelvin in natural sunlight and that actually changes from season to season. The range basically goes from infrared to ultraviolet.
