I just rigged my boat with all 300 watt bulbs. I do notice a difference from the 500's, but I don't think it affected our shooting. Last weekend at the Billy Davis Memorial Shoot I was only using 6 300 watt lights up front and it was plenty. You would do great with 5 300 watt lights right from Menards or Home Depot. Otherwise I'm getting HPS lights next. They've come way down in cost and are roughly twice the light output per the same wattage as halogens.