Aquafine 17498 Equivalent Replacement UV Lamp

I wish to find out if all UVC lamps contain mercury in order to be germicidal, and do all UVC lamps produce an ozone smell?

Most UV lamps used for UV disinfection contain mercury. In the case of low-pressure lamps, only a few milligrams of mercury are present. In the case of medium pressure lamps, which are much higher power, a few grams are present.

Low pressure and medium pressure lamps do generate ozone if they have an envelop made of very pure (synthetic) quartz, which allows the mercury 185 nm emission to enter the air. This UV light is absorbed by oxygen in the air to generate ozone. Most UV lamps are made from a form of quartz that contains impurities that absorb the 185 nm emission entirely, so that they produce no ozone.

This lamp is an equivalent replacement lamp for the following:

They say that UV-C radiation is blocked by the atmosphere. Would the atmosphere become transparent to UV-C without ozone layer?

The sun's rays with wavelengths less than 300 nm are blocked by absorption by the ozone in the stratosphere. You can download the extraterrestrial (AM 0) and the standard terrestrial (AM 1.5) spectra from the National Renewable Energy Laboratory Web Site (http://www.nrel.gov/rredc/). This is why there is so much concern about the reduction in ozone levels caused by ozone depleting compounds (e.g., chlorofluoro hydrocarbons from Freon gases) escaping into the atmosphere.

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