I don't know the right answer to your question, but the right answer for your pocketbook is that you can use any old tube you want. I grew great phals and paphs under 8 dollar 4 foot shoplights.
Nowdays for fluorescent lights I use electronic T8 fixtures (under $10 at Walmart) and a rather expensive (for me) tube which is a Phillips bulb with a lower wattage demand (I think 28W) and a fairly good light output - no I can't remember which one specifically, they are at home and I'm at work. They cost about $3 each!!! *grin*
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Rob's Rules:  http://littlefrogfarm.com
1) There is always room for one more orchid
2) There is always room for two more orchids
2a) See rule 1
3) When one has insufficient credit to purchase more orchids, obtain more credit
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