Candlepower, candlelight, or simply candles was a measure of light intensity.

In 2267, Spock calculated that one million candles per square inch was required to kill the flying parasite encountered on Deneva. When he expressed his intention to be exposed to that amount of light as a test case, Doctor Leonard McCoy protested, asking rhetorically, "Do you know what one million candlelight per square inch can do to your optic nerves?" When James T. Kirk agreed with the proposed treatment, McCoy said he'd get some goggles for the Vulcan. Spock declined again, saying that nobody on the planet's surface would be wearing any, which Kirk also agreed with (TOS: "Operation -- Annihilate!")

During the 24th century, Galaxy-class starship computers could set the light level of a room to a specific candlepower. In 2367, Geordi La Forge didn't care for this ability, preferring to adjust the lighting to suit the mood he wished the room to have. (TNG: "Galaxy's Child")

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