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A comment on The experiment that proved airborne disease transmission. Parent comment

Re:The experiment that proved airborne disease transmission by TheSpiceIsLife on Saturday October 03, 2020 @07:56PM (#24675594)
What magnitude of irradiance is required?

If the required power is,say, 500w continues, or more, that's going to get quite expensive to run.

For example, where I live running a 500w device 24/7 is going to add an extra $1100 a year to the power bill.

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Re:The experiment that proved airborne disease transmission by tzs on Saturday October 03, 2020 @11:26PM (#24676316)
Looking at germicidal bulbs at 1000bulbs.com, the highest wattage bulb they have is 65 watts [1]. Most are well under that.

Looking at random in-duct systems, it looks like they range from 1 to 10 or so bulbs with the later being for commercial buildings. Home systems seem to lean toward 1 or 2 bulbs of maybe 20ish watts or so total. This site [2] says typically $15-30 per year energy cost

[1] https://www.1000bulbs.com/product/113917/AU-LG64T5L.html

[2] https://www.pickhvac.com/faq/hvac-uv-lights/

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