« on: June 24, 2014, 12:42:45 AM »
Has anyone ever observed heat warnings on 600EX-RT flash units?
I had three inside a softbox, and after some 498 shots, I got a slower recycle time and noticed that the LCD panels were glowing red. That was unsettling. I replaced them with three other 600EX-RTs, and after just over 500 shots, I got more red LCDs and slower recycle times. I had the units set at 1/8 power. Fortunately, it was time to switch to natural light.
I didn't use again any of the flashes for more than a week, and everything seems fine. Might the life of the flash tubes have been shortened significantly in any way? I suspect not, but I am curious nonetheless.
On a side note, the ST-ET-R3 lasts for an extraordinarily long time between battery changes. I've replaced batteries in the flash units four or five times, while only twice in the transmitter.