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Only one bulb actually worked properly, the other had a loose part rattling inside of it and flickered a VERY faint light if I could get it to turn on at all, and the one that does work is so-so quality. Not the dimmest, not the brightest, and not even close to the coolest shade of white. Was trying to get uniform lighting in a 60 gallon. The brand new bulb was noticeably dim compared to my 6-year old Aqueon bulb I had installed on the other side. Was trying to be "frugal"...I'm going to spend the extra $10-15 and get more Aqueon brand fluorescent bulbs.
These were packaged well but I noticed they both rattled when I got them out of the packaging. One would not fully light up and the other made a loud buzzing noise. I returned them and will go with a different brand.
Got these to replace 2 bulbs on my workbench light. Use the lamp often for close work . Both bulbs worked well immediately. In less than 2 months, one is burned out. The other is working fine still. Who Knows. Not Happy, Paid for two bulbs, but only 1 works.