Power Yoga

I searched through 9 websites for the exact calorie burn count for Power Yoga, but they differ. Four or five calorie-count websites claim that a 150 lbs person doing a one-hour power yoga session will burn about 500 calories (which I find is a bit much). While others like http://www.fatburn.com/free_tool_activity_burn.asp 
(as well as comments on fitness forums) claim it is closer to 360 calories an hour, which, in my humble opinion sounds more realistic, even though power yoga is physically demanding. (I usually do Rodney Yee's Yoga Burn video).