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When using a white fabric backdrop I find I have to set the backdrop lights (left and right of the model) to be +1 2/3rd to +2 "stops" brighter than the main light. The backdrop lights also need to be at least 4 foot from the backdrop to get a good even spread when using 7-inch reflectors. IMPORTANT NOTES: a) Do not turn the backdrop lights inward too far or they will light the model b) Make sure the model is *always* in front of the backdrop lights! I first learned about this lighting technique from Zack Arias' DVD the "One Light DVD Workshop". He also talks about this on his blog here: http://www.zarias.com/white-seamless-tutorial-part-1-gear-space/