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A standardized light is called a defined light condition under which the viewer can view and assess prints or objects uniformly. The most important standard illuminants D50 are in accordance with ISO 3664:2009 for printmaker and for colour matching in prepress and press (colour temperature: 5,000 kelvin) and D65 (colour temperature: 6500 K) for internet graphic designer. D65 is the default setting for most monitors.
Light of the neon fluorescent type F11 or TL84 is the classic neon light, the typical “department store lighting”. TL84 represents a three-band fluorescent lamp with 4000 Kelvin. This light is installed in many standard light boxes, to compare the reproduction of materials or surfaces with D50 or D65 standard light.