Related Experiment Videos
Visual safety of quartz linear lamps
D A McIntyre1, W N Charman, I J Murray
1EA Technology Ltd, Capenhurst, Chester, U.K.
The Annals of Occupational Hygiene
|April 1, 1993
Summary
Quartz linear lamps (QLL) for space heating emit infrared radiation but pose no significant eye hazard. An aversion response prevents retinal thermal damage, and cataractogenesis risk is negligible when used as directed.
Area of Science:
- Ophthalmology
- Occupational Health
- Infrared Technology
Background:
- Quartz linear lamps (QLL) are common infrared heating devices.
- Existing UK regulations lack specific visual hazard criteria for QLLs.
- The American Conference of Governmental Industrial Hygienists (ACGIH) provides guidelines for light and near-infrared exposure.
Purpose of the Study:
- To assess the potential eye hazards associated with QLL heaters.
- To evaluate QLL emissions against ACGIH guidelines for infrared radiation.
- To determine the safety of QLLs for space heating applications.
Main Methods:
- Review of QLL technical specifications, including spectral output and operating temperature.
- Analysis of potential retinal thermal injury from infrared-A (IR-A) radiation.
- Evaluation of cataractogenesis risk based on ACGIH threshold limit values (TLVs).
Main Results:
- QLLs emit infrared radiation peaking at 1200 nm, with no ultraviolet or blue light hazards.
- Lamp brightness and heat induce an aversion response, preventing retinal thermal damage.
- No risk of retinal thermal injury at normal viewing distances; no cataractogenesis risk from longer wavelengths.
Conclusions:
- QLL heaters do not present a hazard to the eye when used for space heating according to manufacturer instructions.
- The inherent aversion response and adherence to established irradiance limits ensure user safety.
- QLLs are safe for their intended application, meeting established occupational health standards.