Pupil lumen

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last updated：Feb 28, 2024

桜照明

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A new standard for lighting evaluation has already been established in Europe and the United States, considering the state of human pupils!

We would like to introduce "PLM: Pupil Lumen." Recent research has shown that the traditional brightness standard "Lux" is not directly related to human visual capability. Instead, a new concept called "Pupil Lumen (Plm)," which takes into account the state of a person's pupil, has begun to emerge as a new standard for lighting evaluation in Europe and the United States. [Overview (Excerpt)] - The diameter of the human pupil varies between 2 to 8 mm, resulting in an area that can change by up to 16 times. - In bright environments, the pupil constricts, reducing the amount of light entering the eye. - Conversely, in areas without strong light, the pupil dilates, allowing more light to enter the eye. As a result, a phenomenon occurs where the environment feels brighter than the Lux measurement indicates. - The calculation method for pupil lumen involves applying a correction factor (S/P Ratio Correction Factor) to each lighting source. *For more details, please refer to the PDF document or feel free to contact us.

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【Other Overview】 ■ Because the emitting area of the electrodeless lamp is larger compared to mercury lamps and LEDs, the pupil lumen coefficient is higher. ■ Conversely, mercury lamps and LEDs, being point light sources at the same illuminance (Lux), have a smaller coefficient, causing the pupil to constrict and feel darker. *For more details, please refer to the PDF document or feel free to contact us.