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Phototherapy Light Measurement Systems

Scroll down for our selection of light meter systems for use with phototherapy.

Even in ancient times, light was found to be an effective medical treatment

Light provides many benefits to man, not the least of which are energy, heat, and food but it has long been known to have many medicinal qualities as well. Phototherapy, which is treatment by the application of either broad-spectrum or a specific waveband of light, would seem like a modern technique but it actually has it roots in antiquity. The first deliberate use of light as a form of medical treatment can be traced back around 1400 BCE to India where sufferers of vitiligo, a skin condition causing loss of pigmentation, were successfully treated with exposure to sunlight after certain plant extracts were administered which unknowingly at the time contained skin photosensitizing compounds. These compounds, called psoralens, made their exposure to UVA more effective at re-pigmentation. They didn’t know why it worked but they knew it worked. Over the centuries since, scientific research has taken these first simple beginnings and transformed them into sophisticated forms of widely accepted treatments for numerous medical, psychological, and cosmetic conditions.

Phototherapy has many benefits but requires careful control.

Phototherapy has given practitioners and patients new options for the treatment of difficult chronic disorders and problematic conditions such as dermatitis, psoriasis, common acne, eczema, and seasonal affective disorder as well as vitiligo, neonatal jaundice, delayed sleep-phase syndrome, polymorphous light eruption, and mycosis fungoides among others. In many cases these treatments have been found to be as or more effective than traditional procedures while less expensive and typically faster. The demands of a busy world have given way to more powerful phototherapy treatments, particularly narrowband UVB systems, capable of delivering the required exposure in the shortest amount of time, making phototherapy an even more convenient treatment option. With decreased exposure times and fewer required visits, these treatments are more convenient than ever and can now fit around a patients schedule or even done by the patient themselves in their own home, office, or car due to advances in smaller, safer, and easier to use portable and home-use phototherapy light sources. However, with these benefits come certain considerations, while ultraviolet light (UVA and UVB), infrared (IR), and even blue or red visible light have all been shown to be effective at treating man y conditions, also pose certain health risks due to the potential damage to the skin or eyes from over exposure, making it critical to monitor both the wavelength of light and the amount of exposure given to a patient.

Light measurement instrumentation to match any phototherapy application.

International Light Technologies has developed a line of reliable, highly accurate light measurement systems capable of both research and development or clinical use and available to match the wide variety of light sources used in modern phototherapy treatments.


Phototherapy Measurement
Common Sources IL Spectral Range IL Product Options
Click Links Below
IL Measurement Range Units

220-1050 nm RPS900 SPECTRORADIOMETER Customized spectrum W/m²/nm
315-390 nm ILT72 UVA Radiometer 1.00 to 19.99 mW/cm²
Psoriasis treatment booth 315-390 nm IL1700, SED033/UVA/W 2.67e-10 to 2.67e-1 W/cm²

315-390 nm IL1400, SEL033/UVA/TD 2.50e-8 to 8.75e-2 W/cm²

265-332 nm
IL1700, SED240/UVB-1/W
1.33e-7 to 6.67e-2
W/cm²
Psoriasis treatment booth
265-332 nm
IL1400, SEL240/UVB-1/TD
1.11e-5 to 1.11e-1
W/cm²

275-310 nm
IL1700, SED240/UVB/W
3.08e-8 to 1.54e-2
W/cm²
Philips UVB lamp
275-310 nm
IL1400, SEL240/UVB/W
1.54e-6 to 1.54e-2
W/cm²
Narrow UVB source
*312 nm CW IL1700, SED005/TLS312/W
2.00e-8 to 2.00e+1
W/cm²

*312 nm CW IL1400, SEL005/TLS312/TD
2.50e-6 to 8.75e-2
W/cm²
Bili blankets
220-1050 nm
RPS900 SPECTRORADIOMETER
Customized spectrum W/m²/nm

410-485 nm IL1700, SED033/BR/W

1.18e-9 to 1.18e+0

W/cm²

410-485 nm IL1400, SEL033/BR/W 5.88e-8 to 2.06e-1 W/cm²
Bili belts
422-488 nm
IL1700, SCD144
6.67e-9 to 6.67e+0
W/cm²

422-488 nm
IL1400, SCL144
3.33e-7 to 1.17e+0
W/cm²

360-525 nm
IL1700, SCD145
1.67e-11 to 1.67e-2
W/m²/nm
Bili light sources
360-525 nm
IL1400, SCL145
8.33e-10 to 2.92e-3
W/m²/nm

370-515 nm IL1700, SED033/TBLU/W 2.86e-10 to 2.86e-1 W/cm²

370-515 nm IL1400, SEL033/TBLU/W 1.43e-8 to 5.00e-2 W/cm²
* All Radiometers/Photometers/Spectroradiometers are NIST Traceable.
* If units of measure are not shown please contact us (empirical units also available i.e. fc, fL, nits, lm/ft²).