Optical Radiation Hazard

International Light Technologies (ILT) has designed a selection of systems to measure almost any Optical Radiation Hazard application as defined by ICNIRP, ACGIH and EU Directive 2006/25/EC.

Please SCROLL DOWN to review our selection of optical radiation hazard light measurement systems.

Sources emitting optical radiation are of paramount concern to hygienists, safety engineers, and public health officials, both from their beneficial effects and their potential as a hazard to health and safety.

International Light Technologies has a long history measuring optical hazard radiation. ILT's first product for these measurements, the (ILT)ACT5 filter, was based on the ICNIRP* / ACGIH* spectral sensitivity function.

Our product offering in this area has expanded to include products for testing based on EU Directive 2006/25/EC*. Although our product line does not include a high priced research grade double monochromator, ILT has designed a versatile, lower cost, easy to use portable selection of systems to measure almost any Optical Radiation Hazard application with N.I.S.T. traceable and ISO 17025 accredited calibrations.

Many common light sources can produce various damaging health conditions

Welding equipment, lasers, office copiers, air sterilizers, and infrared heat lamps are some of the more commonly encountered optical radiation hazards. While most people are familiar with the damaging effects of continued exposure to the sun or even of the dangers of short-term exposure to welding equipment, many people are not familiar with the more subtle, but equally damaging optical radiation hazards presented by some of these other sources.


Artificial UV light sources, useful for photo-etching, curing adhesives, paint and coatings, air, water sterilization, and controlled plant growth isn't visible to the human eye and can go undetected without realizing the damage that is being done until it is too late.

These artificial sources can have UV levels many more times that of the sun producing a risk for greater injury in less time. Although knowledge about optical radiation hazards from UV light sources may be more obvious, thanks in large part to the sun and all of its publicity, the hazards presented by infrared and blue sources are just as real but far less known.

Lasers, found in almost every home or office in the shape of CD drives, DVD players, cutting equipment, measurement devices, indicators, and as research tools can focus tremendous amounts of optical energy into a tiny spot capable of tremendous amount of damage to the human eye or skin.

Even the smaller, less focused beams caused by scattering pose potential hazards. Some of the harmful effects which can be produced by these types of sources as well as others can include erythema (skin redness), photokeratosis (inflammation of the cornea more commonly referred to as "snow blindness"), skin cancer, Vitiligo (de-pigmentation of the skin), conjunctivitis, and temporary or permanent loss of vision. Continuous or repetitive exposure to low level sources may produce cumulative damage such as cataracts, blindness and cancer.

Safety professionals must weigh the risks against the benefits

While all these sources have great benefits, the risks are there and must carefully be accounted for and personnel protection assured. Industrial hygienists, safety engineers, and public health officials must weigh the factors of human health, safety, and well being against any benefits derived from such sources. As these sources have grown more commonplace, so too has the assessment of these hazards through direct measurement of their light output against national and/or international standards for acceptable levels of human exposure.

International Light Technologies (ILT) has designed a selection of systems to measure almost any Optical Radiation Hazard application. These systems are listed by application in the "Optical Radiation Hazard" table below.

Please Note: EU Directive 2006/25/EC-related information is highlighted in italics in the table.


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Affected Area per 2006/25/EC
Common Sources Sensor Spectral Range/ 2006/25/EC Range ILT System Options
Click Links Below
Measurement Range Units
Unprotected Skin and Eye Hazard; Extreme sensitivity to Any Light Source/ Manufacturing, Welding, Office Light, Office Copier, Solar Simulator, UV Light Emitters 180-400nm/ 200-400nm ILT5000, SED240/ACT5/W 3.00e-9 to 2.50e-3 eff W/cm²
    190-400nm/ 200-400nm ILT1700, SED240/ACT5/W 5.00e-9 to 2.50e-3 eff W/cm²
      ILT2400, SED240/T2ACT5
(Also Measure Germicidal Light)
8e-8 to 1e-3 eff W/cm²
========= ========= ========= ============ ======= ======
Eye cornea conjunctiva, lens skin photokeratitis, conjunctivitis, cataractogenesis, erythema, elastosis, skin cancer   250-400nm/ 200-400nm ILT5000, SED005/WBS320/W 2.33e-8 to 2.33e+0 W/cm²
      ILT1700, SED005/WBS320/W 2.33e-9 to 2.33e+0 W/cm²
      ILT2400, SED005/WBS320/TD 1e-7 to 1 W/cm²
========= ========= ========= ============ ======= ======
Eye lens, cataractogenesis Broadband UV source, UVA lamps, UV curing lamps, UV LEDs 315-390nm/ 315-400nm ILT5000, SED033/UVA/W 2e-10 to 1e-1 W/cm²
      ILT1700, SED033/UVA/W 2.67e-10 to 2.67e-1 W/cm²
      ILT2400, SED033/UVA/TD 2e-8 to 2e-1 W/cm²
========= ========= ========= ============ ======= ======
"Blue Eye" Hazard, Retinal Photochemical Protection, Cataract Hazard LED's, Solar Light, High Powered VIS, Manufacturing, Lasers, Welding 410-510nm/
**see note
ILT5000, SED033/SCS395/TBLU/R 7.41e-10 to 7.41e-1 W/cm²/sr
      ILT2400, SED033/SCS395/TBLU/R 5.56e-9 to 5.56e+0 W/cm²/sr
      ILT5000, SED033/SCS395/TBLU/TD 4e-10 to 3e-1 W/cm²
      ILT2400, SED033/SCS395/TBLU/TD 2e-8 to 3e-1 W/cm²
      ILT1700, SED033/SCS395/TBLU/TD 7.41e-10 to 7.41e-1 W/cm²
      ILT1700, SED033/SCS395/TBLU/R 5.56e-9 to 5.56e+0 W/cm²/sr
ILT5000, SED033/F/HMR/W 2e-10 to 1e-1 W/cm²
      ILT2400, SED033/F/HMR/W 7e-9 to 1e-1 W/cm²
      ILT1700, SED033/F/HMR/W 2.41e-10 to 2.41e-1 W/cm²
NEW! EML Equivalent Melanopic Lux LED Based Lamps, Signs, Headlights, Displays, TVs, etc. 400-600 nm ILT2400 Photometer, SED033/EML/TD Detector 5e-9 to 9e-2 W/cm2 & lux
========= ========= ========= ============ ======= ======
IR-A, Near IR, Retinal Protection Protocol IR Heat Sources, Manufacturing, Lasers 800-1400nm/
ILT5000, SED007/W 4e-11 to 3e-2 W/cm²
IR-A, Near IR, Retinal Protection Protocol IR Heat Sources, Manufacturing, Lasers 800-1400nm/
ILT1700, SED007/W 7.14e-11 to 7.14e-2 W/cm²
Eye lens / Cataractogenesis     ILT2400, SED007/W 2e-9 to 3e-2 W/cm²
========= ========= ========= ============ ======= ======
IR Hazard, Cornea Thermal Injury IR Heat Sources, Manufacturing, Lasers 700-2100nm/
ILT5000, SED623/SCS695/W 9e-5 to 4e-1 W/cm²
      ILT2400, SED623/SCS695/W
NOTE: SCS780 filter can be substituted for SCS695 to obtain cutoff of 780nm
9e-5 to 4e-1 W/cm²
      ILT1700, SED623/SCS695/W 8.57e-5 to 9.52e-1 W/cm²
========= ========= ========= ============ ======= ======
Visible, IR-A and IR-B Bands Skin, burn 380-3000nm ILT5000, SED623/SCS395/W 9e-5 to 4e-1 W/cm²
      ILT2400, SED623/SCS395/W 9e-5 to 4e-1 W/cm²
      ILT1700, SED623/SCS395/W 8.57e-5 to 9.52e-1 W/cm²
========= ========= ========= ============ ======= ======

* ICNIRP - International Commission on Non-Ionizing Radiation Protection
* ACGIH - American Conference of (Governmental) Industrial Hygienists
* EU Directive 2006/25/EC - an EU directive on the minimum health and safety requirements regarding the exposure of workers to risks arising from artificial optical radiation.

** EU DIRECTIVE 2006/26/EC: The range of 300 to 700 nm covers parts of UVB, all of UVA and most visible radiation, however the associated hazard is commonly referred to as "blue light". Blue light, strictly speaking, covers only the range of approximately 400 to 490 nm.