Philips MASTER DimTone LED GU10 spotlight light bulbs are designed to mimic the behaviour of dimmable halogen and incandescent spotlights, while eschewing their lack of efficiency and minimal lifetime.Traditional light bulbs have a tendency to shift towards a warmer colour as they dim while LED traditionally maintains the same colour. DimTone technology successfully mimics this behaviour while delivering all the efficiencies and reduced maintenance costs associated with LED.Running at maximum output, this mains voltage GU10 spotlight option emits a standard warm white beam, equivalent to a 35W light bulb. This changes to a much warmer white as its output reduces under dimming, making it a popular choice for environments that require a warm and relaxed ambience such as bars, restaurants and so on. The amount of energy consumed by the light bulb, though already minimal, also reduces under these conditions.This particular example is compatible with a broad range of dimmer switches and ret