Our office has to purchase replacement UV lamps for our air filtration system. The manufacturer recommended lamps are fluorescent and contain a low level of Hg (3 Mg). So my question is, would we have to include these lamps in our purchasing plan? They are not being used to light a space, the main purpose of these lamps is to disinfect air filters. If the UV lamps need to be included, I was able to get the Hg content from the manufacturer and the lamp life (it's recommended to replace the lamps every 2 years) but I can't find anything on lumen output. How would one go about calculating the picogram per lumen if there is no lumen value available?