So I am one of those, "sometimes there is no substitute for seeing something to believe" types. After some of the recent power discussions here I was told that I may have a power issue. Which led to me ordering a 20awg USB cable that should be here tomorrow. Today I saw the story about the Xenon Flash issue and while I was examining to see if I had the same shiny U16 as others were reporting I saw my power led blinking on and off while the Pi was still functioning (my camera was still outputting live images). To cut back on power drain I removed the USB Wifi adpter I use (an older Belkin). The Led came on and stayed steady.
So I dug out a better wall wart (my samsung 2A charger for my phone) and a known good cable. Lo and behold the power led stayed on even with the wifi adapter plugged in. Suspecting I wasn't seeing the whole story I pulled out my hand usb meter and placed it between the Pi and my wifi adapter. The other day I was trying to get better wifi signal and thinking there may be a bit of current limiting I applied the "max_usb_current=1" setting in my config.txt. The results of using the meter was interesting, I saw current draw up to 1.62A from the wifi adapter! No wonder I have some instability every now and then. I posted some footage on youtube. sorry bout the potato quality https://www.youtube.com/watch?v=GI9FG-guMVw
So now the question is, has anyone seen any good comparisons on multiple wifi adapters and how much power they use.? I am considering the Broadcom unit but its so unattractive and I dont need the extra usb ports. I used to have a Edimax EW-7811Un and maybe I will go that route. This makes it clear though, why powered hub are almost a 100% must have.