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Recessed ceiling lighting falls under the category of general lighting. Lights could be divided according to 3 broad classifications, the other two being task lighting and accent lighting. Particular kinds of ceiling lights could be made into task lighting if specifically developed for such a job, but the main type of illumination provided by light fixtures on the ceiling is that of downlighting, or the casting of light downward.

Illuminated ceilings may be considered a type of ceiling light, in particular when found in otherwise dark nightclubs. Immensely popular more than 3 decades ago, they are very rarely employed these days, and almost never in a residential setting.

Ceiling lighting is quite significant, and not just in the immediately obvious sense of providing illumination at home or at work. Light-sensitive individuals can be greatly disturbed by such things as the very subtle strobe-like effects associated with fluorescent lamps. In fact, there’s a whole field of inquiry that exists regarding the health effects of poorly designed lighting.

Specific kinds of photopollution that relate to ceiling lighting are light trespass, over-illumination, and glare. These are problems typically present in densely populated residences and workplaces. Light trespass is one familiar to college dorm mates, where one is trying to sleep while the other has to study. Over-illumination is the excessive use of light. Several offices keep the lights on throughout the night for office cleaners, while during the day, even when there is bright sunshine, lights are left on anyway.

This causes far more oil to be used than required (in the generation of electricity), not to mention light trespass of nearby buildings. Recessed ceiling lights might also cause glare under certain conditions. But most ceiling lighting these days is designed with ergonomic considerations in mind, especially given the phenomenon of the “sick workplace” and “sick home.”

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