Sir Arcsalot
No, let me apologise if my post gave the impression of any UV or light expertise, or any endorsement of that bulb. I just read that stuff on the Net! I think the bulb claims are misleading at least, given away by the pseudo-scientific 'snake-oil' ads. That fibreoptic-light thing on the ulcer was an intense source, everyone was in welding goggles! If the bulb kills anything at all it would be bugs on the surface of the tube, not a whole room-full. I'd be sparing with mercury compounds, as you say, (drives you crazy eventually- remember Alice's Mad-Hatter at the tea-party? Hatters used mercury to make top hats and derbys, which is where Lewis Carol got the idea!). A safer disinfectant would be common diluted household bleach on hard surfaces, but not sure if it'd knock out viruses. If there IS anything in the white-light stuff, is that why our forbears did 'spring cleaning' and put all the fabrics outside in the sun for a while each year? A lot of old wives' stuff is proving to be true.
Alan