can i swap bulbs like this?

Old 04-22-20, 11:29 AM
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Join Date: Oct 2004
Location: PA
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can i swap bulbs like this?

f17 T8 is what my new light fixture calls for and i bought 4 of them. however i have spare f20 T12 20 watt bulbs and they fit and work. can i use them as well once the other ones start to burn out?
Old 04-22-20, 01:41 PM
Join Date: Jan 2009
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No you can't the F17T8 lamps are for an instant/programmed rapid start ballast while the F20T12 lamps are designed for a preheat/trigger start ballast. they may light on the existing ballast for your F17T8 lamps but probably not full brightness and will have a short life span and if the ballast is an instant start one there is a good chance that it will just destroy the cathodes (filaments) of the F20T12 lamp so it will never work even on the proper ballast

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