926 CATALOG | technical information Luminaires with the designation "CCT Dip" allow you to change the light colour via a small dip switch [usually in the steps 3000K / 4000K / 5000K]. With their high application flexibility, CCT Dip luminaires offer customers who are still unsure about the light colour an enormous decision-making aid - and incidentally reduce your stock requirements. LIGHT COLOUR SELECTABLE The colour temperature [light colour] is specified in Kelvin [K] and determines how the respective light is perceived. WW = warm white light 2.300 K to 3.300 K [high red component] NW = neutral white light 3.300 K to 5.300 K CW = cool white / daylight white light 5.300 K to 8.000 K [high blue content] The following guide values apply as orientation for different rooms following guide values apply: living and sleeping are WW kitchen and bathroom WW | NW offices NW industry NW | CW photo studio / architectural lighting CW The colour rendering index Ra is the measure of the correspondence of the perceived light colour between an existing lighting situation and a reference light source. The smaller the deviation, the better the colour rendition. A light source with Ra 100 reproduces all colours exactly. The lower the Ra value, the less precisely the colours are reproduced. COLOUR RENDERING INDEX RA RA 90-100 very good colour rendition RA 80-90 good colour rendition RA 70-80 medium colour rendition Standard values: Incandescent bulb, halogen lamps up to Ra 100 LED lamps Ra 75-95 Compact fluorescent and energy-saving lamps Ra 80-89 Fluorescent lamps Ra 70-85
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