hey, i have a shoot coming up and i'm thinking of buying a light to help out on exterior shots to augment daylight so i can get good exposure if is overcast and for some static int car shots, (i'm also gonna bring a reflector/bounce board) Would it be a Red head with a specific bulb for day light stuff and then change the bulb again for tungsten work. any suggestions on what i need? it would be handy if i could buy a lighting device that would work for the two, if i change bulbs.