Plants not doing nearly as well as they used to

"RedForeman ©®" wrote
I bet your lights are falling off....

Actually, I changed my tube about 3 months ago, so it should still be fine.
However, I must admit that I've only learned about the tube weakening
phenomenon about a year ago, two years after starting my aquarium. Before
that I didn't know that a bulb loses a lot of its power after 6-8 months,
even though it still appears to be as bright.

Francois