Ho lights

[Rikko]

F72T12/D/HO 85 WATTS ALTO COLLECTION BY PHILIPS.The bulbs are 6' long.

Just to help anybody reading off bulbs...
The F number is the bulb length in inches. F72 = 72" = 6'.
The T number is how many eights in diameter the bulb is. T12 = 12/8 = 1.5" through. That's part of the appeal of T5s - the smaller profile.
The D I'm not actually sure of.. I think it has to do with some standard in bulb starting/firing?
NO/HO isn't something you see all that often, at least on NO bulbs, but it's pretty obvious.

And even without the HO there, go by standards. A 48" tube that is normal output is rated at 40W (there are T8 energy savers that are a little lower, but never mind them). I always multiply off that rather than memorize the different figures. A 6' NO bulb would be "around" 60W (they're actually 55W standard I think). If the bulb number is higher, you can be sure it's HO or VHO.