Osram Decostar lamps are known for their excellent color rendering and built-in UV block, making it a very suitable light source for retail shops. The Decostar is available in two bases: the GU4 for and the GU5.3. Check your current base and use the filters on the left to see all options in that base. You can use the filters to select the right wattage, shape or color. The Osram Decostar works on 12V and needs a transformer to work properly.