This is the light that started it. If memory serves me right this is one of the earliest affordable 1xAA light with a boost to drive a 5mm LED. It is also one of the first 1AA 5mm light to appear on craig's led museum
http://ledmuseum.home.att.net/inf1.htm
Since then there are a few versions as time pass many other LED lights pop out and stole it's thunder. CMG has actually patented the boost thingy with the Infinity... The first version is actually painted, then followed by anodized bodies.
OD = 19.00mm
ID = 14.67mm
Wall thickness 2.165mm. I would be surprise if you can smash it with daily usage. It's built like a tank. The Japanese 5mm Nichia is overdriven to about 60mA by a Zetex 300 driver in standard configuration. There's nothing to fear as the Nichia can sustain high current better than any 5mm on the market. It is similiar to the LED found in ArcAAA. There has been many test by a number of cpf members that confirms the durability. Most versions of the Infinity electronics is potted with epoxy and there's two tiny o ring around the 5mm LED.
I felt very crossed when Gerber changed the design. :mecry: