Comment by crazygringo

> I have a standing tanning machine.

Lucky you! So convenient. Yeah, then there's probably a good chance that's developing the vitamin D you need, although bulbs do take around 60 seconds to warm up to full brightness, but I'm just basing that off visual brightness and assuming that UV warm-up time is the same. I'm sure getting your vitamin D levels tested will definitely tell you if you're getting enough or not. If not, well you can always do 2 min, but blood tests give you the definitive answer there.