so, i've been volunteered/nominated to take photos for a dance studio. the job itself doesn't pay anything, but i get to handle selling prints to the parents. i will be doing these over the course of 2 days, one in january, the other in march. the largest group should be 16-17 kids. i planned on picking up a wide roll of white seamless for a background, but its the lighting i'm not sure about. anyone tried lighting groups this big with speedlights in umbrellas? should i look into renting/buying a couple of cheap monolights? are the really cheap ones even worth it? the shitty one i picked up for $25 shipped on ebay is ok for doing small small shit like product photography, but i wouldn't use it for something like this. the date in january is just the competition teams, and the full lineup of classes is in march. i will be using my 30d and 17-40 to actually take the pictures, if that's needed info.