What about touching the components inside the lamp? Is all the metal parts and the arctube safe to handle? Especially if using the arctube to sharpen knives? lol
I would better be really careful. There are many sharp things, many have stresses inside which may suddenly get relesed once some part gives up and shoot the sharp parts around (some metal subframes welded together, the arctube itself, the outer bulb,...), many are fragile and tend to b reak into sharp pieces, many are contaminated by toxic elements (Hg, Ba,...), often mixed with a reactive substance so easy to spread (Na, Ba,...).
So "uses" as "knife sharpener" are really very bad idea, better to not do it.