Tungsten lights get very hot. Always wear gloves and make sure it's cooled down before handling. Don't touch the surface of the globe, as oils on your fingers create hotspots on the globe, which can cause it to break. (You can clean gloves using isopropyl alcohol). You also want to make sure the lights are turned off before moving them to preserve the life of your globe. A mesh cage in front of the light prevents any glass from exploding in case something does happen to the bulb during a shoot. When you dim a tungsten light, the lower your color temperature becomes, causing your image to become warmer. If you want to prevent this color temperature change, you can use scrims which attach to your barn doors on the light. These will reduce your light's output by a certain number of stops, and you can stack them onto each other. You can also get half scrims to cut or reduce light on particular spots of your shots. You can also use Gels (ND or diffusion) to reduce the output or soften the light. If you want to mix your tungsten lights with LEDs, you can use color correction gels (CTB).
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