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What is Cold Start Time?

Cold start time is defined as the amount of time needed to bring an HID lamp from a cold condition to 90% light output.

Are HID Lights Slow to Warm Up?

Due to its design, an HID bulb does take a little longer to reach 90% light output than other lamps. The bulb contains metal salts that melt and evaporate when the arc is ignited. It’s not until the metal salts are fully evaporated into plasma that the light reaches full power.