I had one lit, day and night, for three years, and it gave a lovely glow.
Dh recently told me that he had changed the bulb twice in that time.
I also learned that a footbath, and tub bath in a 1% solution of the crystal mineral salts does wonderful things for the body. For me, all anxiety vanished, completely unexpectedly, and the edema on the tops of my feet reduced dramatically.
I hadn't thought of the negative ions. Nor had I thought of putting the lamp near my computer. What a good idea!
I spoke to the lady who distributes the 'brand' I bought. She mentioned that she keeps three burning in her home...two in her office.
She must have a good reason for that.