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• The lamp base / holder screw fixing position.
• The physical dimension of the LED lamp and how it fits into the existing housing.

• The electrical characteristics of LEDs compared to the existing system. (mains voltage, low voltage, control methods).

• The location and size of the light emitting surface in relation to the luminaire reflector and in comparison to the original light source.

• The light distribution, lumen output and other photometric properties like color temperature in comparison to the original light source.

• The heat generated by the LED during operation and the maximum operating temperature.