I found a web site were you can buy replacement/spare colored led modules. Module should fit Ultrafire 900, and UFCS8 lights and other simular lights. Just email me at foxpro51@comcast.net
The modules on the Solarforce link aren't the right ones, they are for Solarforce L2 lights which are Surefire 6P clones. You can build a nice light with these but they don't put out as much light as the EWT modules. A smooth reflector and a fisheye lens helps the throw but the Kill Lights still beat them.