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NOTE: It may take 15-20 minutes to warm up the laser lights projector , when the laser light by plugging the power adapter into the wall/power socket. The green light may be dim at first but will become more luminous as the laser light warms up. The warm up time needed will vary based on the surrounding temperature. If the temperature is zero (0ºC, 32ºF) or thereabout, warm up time will be about 3 minutes. The needed warm up time will increase to 15-20 minutes as the temperature falls to around -20ºC (-4ºF).