2- A FAN IS NOT NEEDED TO CIRCULATE THE AIR. The super-oxygen molecules reach out from the light bulb to about the distance of 8 feet. Of course, the closer things are to the light the better. Also, the air naturally circulates near and around the bulb. However, a fan might help the process go faster.
"The harmful effects from exposure to ultraviolet (UV) radiation can be classified as acute or chronic. The acute effects of UV-A and UV-B exposure are both short-lived and reversible. These effects include mainly sunburn (or erythema) and tanning (or pigment darkening). The chronic effects of UV exposure can be much more serious, even life threatening, and include premature aging of the skin, suppression of the immune system, damage to the eyes, and skin cancer.
Ultra-violet light is an effective method of sanitation. Ultraviolet lamps are used in sewage treatment plants, hospital clean rooms and many other areas where killing bacteria, viruses and spores is crucial. Ultraviolet light kills cells by damaging their DNA.
The light initiates a reaction between two molecules of thymine, one of the bases that make up DNA. UV light at this wavelength (shortwave UV or UVC) causes adjacent thymine molecules on DNA to dimerize. The resulting thymine dimer is very stable. If enough of these defects accumulate on a microorganism's DNA its replication is inhibited, thereby rendering it harmless. The longer the exposure to UVC light, the more thymine dimers are formed in the DNA. If cellular processes are disrupted because of DNA damage, the cell cannot carry out its normal functions. If the damage is extensive and widespread, the cell will die.
However, ultraviolet light is only able to harm cells that it contacts. Even a small crack can hide spores in its shadow, keeping them safe from the UV. And although UV light is also harmful to people (it damages our DNA too!) - as long as we stay out of direct exposure - it is possibly a better alternative to some of those other nasty chemicals out there."