SAE Class 1 is the highest possible standard for omnidirectional emergency warning lighting, and hence why it's most often used for emergency response vehicles such as police, fire and ambulance. Lights in this class have a candela value greater than 8100, with some reaching close to 18,000 cd-s/m when used to clear traffic in emergencies. SAE Class 1 lights are 4 times more intense than SAE Class 2 lights and 10 times more intense than SAE Class 3 lights. The beacons are subjected to intensive colour and photometric testing as part of the standard, however crucially; a beacon does not pass unless it ALSO passes a series of mechanical and environmental tests as well.
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