The Ledvance SUPERIOR LED Spot Reflector G53 AR111 13.5W 950lm 24D - 927 Extra Warm White | Best Colour Rendering - Dimmable - Replaces 100W is the perfect replacement for a conventional 100W halogen spotlight bulb that has a G53 base and a 927 Extra Warm White colour code. This bulb has an 'Aluminium Reflector' (Reflector) shape with a diameter of 111 mm and the terminals are 53 mm apart. In rooms that are exposed to moisture, G53 LED bulbs are safer than halogen bulbs because they work on 12 volts rather than 230 volts. The lower voltage means that the use of a transformer is necessary. Suitable ones can be found under 'Accessories' on this product page. The transformer you need depends on the number of bulbs you want to connect. If you need advice, our customer service team can help you make the right choice.