High Output Florescent lights

[Stray59]

Hey everyone !
I went to Home Depot yesterday and found a two-tube, T5, High Output florescent light strip - $39.97 in Indianapolis. The two HO bulbs cost an additional $20.00 and I have yet to purchase the power cord (they will get you on anything), which is hopefully under $20.00. It is rated at 8900 lumens and has a efficient, low heat, digital ballast. It claims to put out 2X's the light of a comparable standard T5.
Phillips puts out the bulbs I have (F54T5/TL841/HO/ALTO), and they state that they put out 5000 lumens (?). The box gives the following ratings: color Rendering Index of 85; color temperature of 4100 k, wattage of 54.
I know nothing about these, or florescent lights in general, and the man at the store stated they were new to the market. The fixture is put out by Lithonia brand, but Sylvania is advertising the same thing and obviously Phillips is at least supplying bulbs. I was told they will ONLY use HO bulbs, but I am a little stumped about the difference lumens of the fixture and the bulb; did I just buy a dimmer bulb? It was the only bulb they had for these fixtures.
Has anyone had any experience with or know anything about the usefulness of of these related to orchid / plant growing? What does the color rating and color temperature indicate to you?
Any feedback is really appreciated.
Thanks
Steve