I have a light rack with overdriven fixtures.

Lately, some of the tomato seedlings are looking bleached.

I never thought that fluorescents could be too bright !

One other thing... the bleaching seems worst under a purplish 48 inch tube I got long ago. It was from a pet store used for an acquarium.

Could this purple tube be the problem?

I note that the lettuce has no trouble with the bright light.