This could be due to a number of different reasons. In order to ascertain whether or not you have received a faulty bulb:
Please ensure that the bulb is receiving power from a switch/dimmer
Please check the bulb is securely in the fitting
Please place the bulb in an alternative fitting on the same circuit
If you have an MR16/Low Voltage bulb please ensure the transformers are compatible with LEDs
If you have a GU10/Mains bulb that is still not emitting any light after carrying out the above tests, unfortunately, it’s highly likely that the bulb is faulty and will need to be replaced. While we appreciate that this may be frustrating, unfortunately, from time to time this does happen. We retains an excellent success rate with very few of our bulbs being returned as faulty. If you have been unfortunate enough to be in this minority, rest assured we will replace the faulty unit. Please read our Returns Policy to process a return.← My LED bulb will not switch on?