I've been curious of this for a while, Lamps that first pop into mind when I ask this, are Mercury lamps, Metal Halide lamps, Halogen lamps, Fluorescent lamps and LED's.. I doubt these emit any noticeable amount of UVC, but I figured I'd add that in the description just to see what would happen. I'm more concerned with the UVA and UVB... One of the reasons I'm curious is because I'm wondering how well these lights help the production of Vitamin D, I'm also curious about the effects they have on skin whether it be detrimental or otherwise...

LED don't emits UV at all. Fluorescent emits very little amount of UVA which isn't harmful. halogen lamps emits small amount of UV if its quartz outer have UV dopants. Hard glass halogens don't emits any UV. Mercury and metal halide lamps emits mainly UVA.

And regarding the vitamin D production:
The safety regulations governing artificial light sources restrict the amount of allowed UV radiation (any kind) so much, it has no effect (good or bad) at all. So in order to get some noticeable exposure, you need to look for special sources.
But spending some time outdoors would most likely be way better option, it does not matter if it is clear or cloudy, the UV exposure does not change that much (it just get diffused by clouds, so it become less directional)...

And regarding the vitamin D production:
The safety regulations governing artificial light sources restrict the amount of allowed UV radiation (any kind) so much, it has no effect (good or bad) at all. So in order to get some noticeable exposure, you need to look for special sources.
But spending some time outdoors would most likely be way better option, it does not matter if it is clear or cloudy, the UV exposure does not change that much (it just get diffused by clouds, so it become less directional)...

I do spend a lot of time outdoors... problem is though.... I primarily do it at night because during the day I got stuff to do lol....

Halogen capsules emit UV light. I don’t know specifically how much UV light or the distribution of UVA, UVB, or UVC rays is usually emitted. However, I do know that non-enclosed halogen lamps, such as the T3 linear halogens do emit enough UV radiation to cause skin irritation with prolonged exposure. On the other hand, enclosed halogen lamps such as modern A19 halogen-incandescent bulbs, or even my 1000 watt Philips IODE halogen lamp seen in my profile picture here do not emit any harmful UV radiation due to the outer glass filter.

What about those so called special fluorescent lamps like Osram biolux. Those are said to feature some uv spectrum output but how much is it compared to normal fluorescent lamp?

What about those so called special fluorescent lamps like Osram biolux. Those are said to feature some uv spectrum output but how much is it compared to normal fluorescent lamp?

Orders of magnitude...
There is assumed the installation and the regime underneath take care of the correct exposure (it is supposed to be part of the design objective, unlike with the general lighting system)...
Exact outputs are specified with the datasheet of each particular product, usually along with the life rating, when such output is guaranteed (so when the lamps are supposed to be replaced)

When looking at the plant lamp lighting-they have both T5 fluorescent and MH "finishing" lights that emit UVB radiation.There are caution notices on the fixtures and bulbs.They define finishing as the final stage in growing palnts under lamps to condition them to the UVB,C they will get when exposed to the sunlight outside.I AVIOD such bulbs!!!!!Others are fine and safe.with those lamps you could turn a grow room-tent into a tanning booth!

When looking at the plant lamp lighting-they have both T5 fluorescent and MH "finishing" lights

I have never heard of, nor seen those (atleast the fluorescent since that's what I use) ...gonna have to go check eBay

For plants that will be moved outside, I just stick an Actinic-03 aquarium lamp (as one of the 6 lamps) in the fixture. Seems to do good

Hortilux makes the fluorescent lamps-T5-Their "Power Veg T5 FS+UV.These T5 bulbs produce both UVA and B radiation.Yes-B radiation is in the tanning range.Hortilux makes these lamps for flowering-warm colors-and vegetative growth-blue colors.So,if you use these bulbs the B radiation is a hazard.You can see these lamps on the Hortilux website and their dealers.

Hortilux makes the fluorescent lamps-T5-Their "Power Veg T5 FS+UV.These T5 bulbs produce both UVA and B radiation.Yes-B radiation is in the tanning range.Hortilux makes these lamps for flowering-warm colors-and vegetative growth-blue colors.So,if you use these bulbs the B radiation is a hazard.You can see these lamps on the Hortilux website and their dealers.

Ok.. I see the PowerVeg lamps on eBay in various spectrums including the ones that put out UV
If they were cheaper I'd be somewhat tempted to get one & try it to see if it does better than what I use now (though the UVB would worry me a bit - for what it might do to th the fixture & everything in the room where I start seeds / the fish in the tank there, and ofcourse the little bit of time I was in there every day). At this point I'll probably just stay with Actinic-03 since it seems to work well (though it too is not something you'd want to sit under for any length .. very intense powerful blue (not sure what type of UV it puts out but deff something! Only think I know is it has a peak of 420nm)

If I find a deal I may get one each of the PowerVeg 633 & 660 'Red' lamps to check them out since there'd be no safety issues...

The Power veg lights should be safe-the FS + UV is the worry.If you use those in a fixture with a borosilicate glass lens then the UV shouldn't be a problem.The Hortilux T5 bulbs are meant to work in any high output T5 fixture and ballast.The color ones are tempting-have a few 4' high output T5 fixtures I bought from Lowes.Again Hortilux posts warnings about the FS lights on their website.