I have seen various posts here and online on lighting a muslin backgdrop (white) to get that "pure" white look: light the subject, light the backdrop separate and keep the model away from backdrop. As everyone uses different lights, I would like to know which light(s) are good, last long, lights up if possible the and really helps to give that white look. Looking to spend less than $100. Is this a realistic budget to get what I want? I currently use a speedotron 1604. I'm sure the lights will serve other purposes for what I'm looking for, but as an amateur still have yet to learn and how I can really take advantage of these lights I plan to purchase.
As you can see the background is way off, not uniformed (by the way these are not pp yet). I know I made errors on my part as well. Have tried to pp but the background ends up white on a section and not other sections (more like a radial gradiant of white and dark grey). Included picture of set up and used a 50 f/1.8 on an canon xti.