Well I just shut the lights off.
The 950 ran 1hr 35 minutes when it started cycleing between high and low I assume an indication that the batteries where about done so I called it done, Upto the point of cycleing the light still was bright.
XL250 ran 2hrs 15 minutes at which point I noticed a decline in the brightness of the light but let it run another 15 minutes which it was still somewhat bright but a noticed difference from the 2hr 15min brightness.
The first 15minutes of the time I had the lights indoors at about 70degrees 950 was warm to the touch the 250 was cool, at the half hour mark the 950 was real warm almost hot the 250 remained cool.
I then moved the light outdoors appx 35deg temps 15minutes the 950 was warm and the 250 felt cold at the 30minutes the 950 felt luke warm the 250 remained cold I then brought both lights back indoors so I could monitor there brightness.