Crompton 5747 12v 3.5 watt GU4 MR11 LED Light Bulb - Cool White - Extremely low power consumption of only 3.5W. With a diameter of only 35mm, this MR11 spotlight is an ideal retrofit for a 35W halogen MR11s. Important Information: Crompton 12V MR11 lamps will operate with most AC or DC 12V transformers. However, some 12V transformers may have a minimum required load which may not be met when installing low powered LEDs; these transformers may cause flickering or the LEDs not to function correctly.