New Lamps, Old Issues: CFLs and Ultraviolet Radiation

To avoid unsafe levels of UV exposure while saving energy, the right type of fluorescent bulb is essential.

Incandescent bulbs are increasingly being replaced by energy-saving compact fluorescent lamps (CFLs) with integrated ballasts. These lights generate ultraviolet (UV) radiation from electrical discharge into mercury vapors. Energy in the UV range is converted to visible optical radiation by a phosphor that coats the inside of a glass envelope. Unfortunately, some UV rays pass through the phosphor coating and glass envelope to endanger skin.

The investigators of this safety study used a spectroradiometer to measure the UV spectral irradiance emitted by 73 CFLs from nine manufacturers purchased in the U.K. (most were 11- or 12-watt bulbs). They measured irradiance at a distance of about 8 inches from the bulb. Double-envelope bulbs emitted almo…

Reviewing Author

Mark V. Dahl, MD

Disclosures

Consultant / Advisory board Ulthera, Inc.; AuBio LifeSciences, LLC; Paris Therapeutics

Equity Elorac, Inc.; Makucell, Inc.; Paris Therapeutics

Editorial boards UpToDate

Leadership positions in professional societiesNational Rosacea Society (Chairman, Medical Board)