It can cost up to twice as much to heat an open-plan room that has downlights as one with a single-bulb ceiling light.
Most recessed downlights have large ventilation air-gaps that keep the light bulb (and your house) cool, by venting warm air from your living areas into the roof space. "Little chimneys” - as downlights are known in energy-efficiency circles - could be robbing you blind.
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