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High colour rendering and
light quality in dental practices
One usually works with three light zones in a dental practice. In the patient treatment area, an
illuminance of 1000 lux is specifi ed (in accordance with EN 12464-1), while 500 lux is suffi cient
for general lighting in the treatment environment. Special luminaires providing 5000 to 10000
lux are used to illuminate the operating area. The demand on colour reproduction quality is
particularly high in a dental practice. In cosmetic corrections or when matching artifi cial teeth
with the patient's own teeth, even minimal colour diff erences between teeth can impair the
overall aesthetic appearance. Therefore, neutral or daylight white illumination by high-quality
LED luminaires is required throughout the room. These achieve Ra values of up to 98 – for an
almost true-colour result.
A double-sided or circumferential rectangular-square luminaire arrangement must be provided
above the examination chair so that patients are not dazzled when lying down. Full spectrum
LEDs create exceptionally natural working and medical assessment conditions thanks to their
high colour fi delity.
Requirements
• A colour rendering value of Ra ≥ 90 is required throughout
• In addition, even higher colour rendering values are
useful for checking colour nuances in dentures
• In the visual task area, ≥ 500 lux is required as horizon-
tal illuminance
• In the patient area during treatment horizontal ≥ 1000 lux
• A high indirect component of the lighting reduces
unpleasant glare for the patient
• In the operating area, the special requirements of EN
ISO 9680 apply
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