Maybe I'm confused about your question, but I just happened to buy some 24" replacement lights (LED type, for either T-8 or T-12) in Walmart for my kitchen,
& they sell the 24" fixtures there too. I do not see a third (grounding) wire on any of these fixtures...they have regular 2 prong wall plugs.
I'm no electrician either but it sounds to me as if a light used inside a cage (?) OUGHT to have a grounding wire...for safety? None of my cage lights are inside.
You might try calling either Lowes or Home Depot (or visiting) and ask someone for help in "lighting" department. And look at Walmart.com, they have quite a few.
Doesn't say much for DIY's customer service...
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