I have 50 used, full-spectrum aquarium bulbs, which are still good, but not strong enough to support aquarium plant growth. Probably still very good for helping people with seasonal affective disorder. I hate just throwing them out!

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    Have you tried listing them on a swap site, such as Craigslist, or even Ebay? You could also try contacting your local aquarium supply store to see if they know of anyone that could use them. – LShaver Feb 4 '18 at 15:23

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