Crompton 12V LED Glass MR16 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. If in doubt, Crompton Lamps can supply a suitable LED driver (Part number: LEDDRIVER10W) which is guaranteed to drive 1x 5W LED Glass MR16. Contact Crompton Lamps for more information or for prices of our LED Driver.