Why do some preheat fluorescent tube ballasts say “straight tube only”? « on: November 18, 2022, 08:13:05 PM » Author: WorldwideHIDCollectorUSA
While looking at some preheat fluorescent tube ballasts to add to my collection, I noticed that some ballasts of this type say “straight tube only” on the etch for some reason like these Advance ballasts shown below: https://www.ebay.com/itm/273514613604 To me, it seems like they might not mind running circline lamps or pin based CFL lamps without any issues. Why are these specific ballasts marked “straight tube only”?
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Desire to collect various light bulbs (especially HID), control gear, and fixtures from around the world.

DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.

	Re: Why do some preheat fluorescent tube ballasts say “straight tube only”? « Reply #1 on: November 20, 2022, 08:25:36 AM » Author: dor123
I think if it can run 18W T8 and 20W T12, so it can also run 23W T9 circular lamps and PL-L 18W.
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