This yellow backdrop came from firing a single M90 head with a yellow gel taped over the reflector. There's a 4x6 foot tall LightForm white panel reflector camera left,and the main light is camera right and is one M90 head inside a 40 inch diameter Lastolite Umbrella Box. I later turned this yellow into an orange-hued backdrop by using Photoshop's selective color tool,and subtracting cyan from the yellows.