When I did mine several years ago I figured out that I wasn't going blind. Fluorescent lights dim so slowly it's hard to tell until you see the dark spots .
48w , 6000lm , frosted , 6000k , brite white . that is the listing on them . the bulbs in my booth are daylight bulbs . give a real good true color . they have a slight blue hue to them but put out a lot of light . problem is when they get weak you don't realise it until your blind .
they will be here tomorrow and i'll get them swapped out this weekend .
Forgot the 4' bulbs I got a few years ago were the 6500's . I got one in my temp work paintbooth next to a 4000k homestore bulb to show the difference. You can turn the 4k bulb on & off next to the 6500K & not see a lighting difference next to the brighter bulb.