White and Color Ambiance A19 Single Bulb Gen 3. Expand your Philips Hue Gen 3 system with this single Hue White and Color Ambiance Extension Bulb, which produces 16 million colors. Combine up to 50 bulbs with a single wireless Hue bridge and control all their parameters with the tap of a screen using the Hue app on your smart device. The energy efficient A19 LED bulb has a lifespan of 25,000 hours. Enjoy richer colors including improved, deeper green, cyan and blue colors. The A19 form factor and the 10W screw base fitting allow the Hue White and Color Ambiance Extension Bulb to easily fit into common light fixtures.