My new GE electronic ballasts list T8's in 32, 25 and 17 watt, over a wide voltage range (120 to 277), and the GE ballasts come in one, two, three and four bulb versions. I have not seen a 17 watt bulb in the wild but some big box stores carry the 25 watt versions from Philips.
Richard.
I would guess that's your equivalent of our 2' 18W tube, which is very common in modular ceiling luminares in groups of 3 or 4 (at least in Europe).
Our big box stores in the USA sell a 4' Philips 25 watt T-8 what works to perfection with this GE electronic ballast. I assume GE also offers a T-8 in this size but I have not seen one. This bulb puts out about 5% less output than the same color temperature 32 watt Philips bulb. A great combination if you don't require a warm color temperature. It has an 82 color quality rating.
Richard.
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