Are their proper brackets for installing light fixtures in a suspended ceiling? I assume there are and expect them to be expandable to fit between the main tee's or main tee and wall angle. But I cannot find them at local building suppliers. Do these exist?
The ceiling hooks for hanging planters come to mind. But is your suspended ceiling panel strong enough to support the light fixture?
Caddy mfg. makes a T bar support for surface mounted fixtures.
These might solve your problem:
Here is the link if it's a bar for surface mount box, you're looking for:
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