Lot of 3 Alienbees B1600 Pro Photoflash Photo Studio Lights Power On Tested. All three lights power on. I put a regular lightbulb into them and two of them lit up, adjusting brightness with the slider. The last one powered on and the dump light was illuminated.I was unable to "dump" the light and turn on the bulb. I don't know if there is any issue or not. I'm not familiar with flashes like this. One comes with the protective cover.