B18 beacon with both blue and amber light in the same beacon. B18 is an LED warning light with a flash light pattern in a clear lens for 3 screws flat mounting. The lamp is approved according to ECE R65 class 1 for amber and class 2 for blue light. B18 has 15 diodes. There are 11 flashing patterns to choose from. Connection: Red + for amber light. Red +, yellow + for blue light. White + for night setback. Black - (earth).