You dont get uvc from incandescent. To get uvc from a fluorescent (mercury plasma) bulb, you need it to be void of phoaphor and made with a quartz tube. Otherwise, UVC is only present when you are in proximity to welding. Uva and uvb are what you get sunburn from, and what gives you that unpleasent tingling when you're in direct sunlight at high-noon. Its best to avoid direct sunlight mid-day and stay in shade amidst greenery, because Rayleigh blue-scattering is minimized at that time of day.
Discussion
Yes I know. I deliberately use mercury plasma to create disinfection lights. I was speaking about the metal halide lamps. I could not find the spectrum of any but some that are sold as full spectrum specify that people should not spend there more than few minutes because of the UV. So the question is. Is there one or more full spectrum minus UVC on the market, not for plants only.
UVC is highly carcinogenic. You don't want to be exposed to anything that emits it, even for a few minutes. It can also burn your corneas and cause blindness. UVC doesn't occur naturally on Earth because it is filtered by the ozone layer, scattered by the Rayleigh effect, and absorbed by oxygen gas. Metal halide bulbs, which are mercury vapor bulbs, do produce UVC, although they have a coating to absorb most of this spectrum. I was mistaken in earlier posts, confusing halogen with metal halide. Yes, you do not want to be in close proximity to metal halide bulbs, not only because of some UVC emission but also due to their intensity in the UVB and UVA spectrum.