Roscolux 13 Straw Tint Color Filter

 Lighting designers use R13 to evoke sunlight. R13 presents a warm glow contrasted against blue or amber gels. 

R13 absorbs nearly 70% of blue light then arcs up to absorbing less than 30% of green and passing more than 80% of yellow and nearly 90% of red. 

 Use R13 in key lights and color washes to create a sense of late afternoon sun.