http://SmokingStrobes.com: My speedlights always have CTO gels attached - either in front or ontop of the flashhead. I got plenty of questions regarding this. Today I encourage you to pimp your Speedlights in a similar manner with your own CTO gels. It enables you to blend the light of your flash with light from Tungsten lightsources in a a smooth and believable manner. Check http://SmokingStrobes.com/cto for links to the Rosco Strobist Collection gel kit and others.