The Lee Filters Gel Sheet 200 Double C.T. Blue Lighting Filter 21x24 converts tungsten (3200K) to daylight (2600K). Lee Filters provide high-quality lighting filters in a vast range of colors that are precisely consistent from batch to batch, long-lasting and reliable. Lee Filters includes bright and powerful colorants accurately coated onto base material, high specification, ensuring a level of reliability and performance which is second to none. Every filter is checked against a scientifically generated set of parameters.