The products work seamlessly with existing Hue systems, just like any indoor lights. The lights come in white as well as white and color ambiance. The Philips Hue Lily ($279.99) is a new spotlight system that you can use to highlight your garden, while the Calla (starting at $129.99) is designed for path lighting. Other products in the outdoor range are called Lucca, Tuar, Turaco and Ludere and will start at $49.99. Phillips is hosting a press conference about its outdoor lights on Monday, March 19th. Presumably, we'll have more information on the product's availability at that point.
Update: A Philips spokesperson let us know that the outdoor Hue lights will be available this summer in the US.