i have a cheap light kit that uses these 500 watt candecent(?) bulbs. theyre pretty much like regular house bulbs with higher wattage and a longer base. my concern is that i might have to have some spare bulbs in case one of them go out while i shoot and i dont know where to get these. i checked my local home depot and i didnt have any luck. and i looked online for a few websites but im not too confident that i know what im looking for. ive seen some sites that sell them for 20-30 a bulb and some that sell them for 5-10. so if anyone has some advice they can throw my way, id greatly appreciate it.