15 x 42mm Festoon bulb - equivalent fitting to B1240B and good upgrade option for that bulb proving much brighter in testing. 180 degree light from 6 x SMD 5730 LEDs. These LEDS are brighter than 5050 LEDs and hence the bulb features a finned aluminium heat sink on the rear. Compatible with either negative or positive earth systems. Very low current draw - over 75% less than incandescent and halogen bulbs so great for low powered electrical systems. 6000K bright, white colour temperature. 12.5mm wide LED section.