I bought some cheaper clamp on floodlights that have a max of 150 watts...is it safe to run the 250watt photofloods in these? I ran a 200watt regular bulb for 30+min in a softbox umbrella and its was fine, a bit warm but not hot,as well as the cord. Also I have these that I bought on ebay 2 for 20 shipped no clue on the wattage limit? is there a way to test it out and see if its safe?? I have an extinguisher on the desk and never leave them on and unattended. P.S. incase anyone wants to know...those AC lamp brackets above from ebay are junky, certain bulbs screw in real hard (making one of them flex and crack slightly) I bought them thinking I would save on spending 15 bucks on an umbrella adapter for the lightstand...:x I'm using the silver lined umbrella softboxes if that makes a differance for my question.