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6 DESIGN CRI/Ra The colour rendering qualities, popularly referred to as Ra or CRI, are measured from 1-100. This number describes the spectral distribution based on eight sample colours. Daylight is full-spectrum, which compared to RGB LEDs and Halogen makes colours look better. A CRI above 80 is considered standard, but 90+ is preferable in PCBA ED 55, 100 equals full-spectrum daylight and is hard to reach with artificial light. High CRI is used mainly in situations with colour-critical tasks. In PCBA ED 55, CIE +90 is desirable for eating situations, making the food look better and more interesting. Healthcare standard for rooms, hallways, offices and common areas are CRI+80. Hypothetically, results from Küller et al, 1995 implies that low CRI (<55) can have a negative effect on long-term recall, as low CRI does not enhance recall and recognition, as it does not produce appropriate context cues. (Knez, 1995) This implies that both CCT and CRI can affect mood and cog- nition. LUX Light emitted from a light source is called flux (cd) and measured in can- dela, referring to the light emitted from one candle. The intensity of the emitted light in a certain direction is measured in lumen (lm) and when the light hits a surface, the light is measured in lux (1 lumen/m2) also referred to as the illuminance. When light reflects of a surface and finally reaches the eye, this reflected light is measured in cd/m2 and called the Luminance. One cd/m2 is the amount of light that one lit candle would produce. (Lysviden. dk, no date) Master thesis · MSc Lighting Design · Pernille Bech-Larsen · Fall 2017 78 Figure18: Kruithof comfort curve (Kruithof, 1941; Oi and Taka- hashi, 2007)PDF Image | Healing with light
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