As James noted below the Infinity task light (about $19) is an incredible piece of equipment and an instant "standard" item. I have the green and red versions and one or the other is with me wherever I go.
I thought I would never need another light like the infinity, until the Arc LS (about $22) came along. This is a smaller and brighter version of the same basic desing. ARC took the infinity concept in a different direction. They gave up a chunk of battery life for greater brightness.
The ARC LS is shorter (2.7" long vs 3.2 " for the Infinity) and smaller in diameter. It uses a single AAA battery in place of the AA in the Infinity. The ARC is much brigher (comparing red to red), but it burns for only about 6 hours on a single battery (compared with a real world 50+ hours with the Infinity). A major innovation with the ARC is a special "step-up" power circuit that keeps the brightness more stable as the battery burns down. Even though the Infinity burns much longer the beam dims more noticeably as the battery runs down. The ARC will give you 5 hours of bright light before it starts to dim significantly.
They are both waterproof although the Infinity is rated to 10 feet and the ARC to 3 feet. Both are rugged and should take a lot of abuse, although I must tell you that I had to return eearlier versions of both lights with serious defects. The newer versions are much improved and tougher.
I think both lights have a niche. The brighter ARC is a better task light if you need the extra candlepwoer and don't care so much about battery life. Five hours is an excellent batery life, don't get me wrong, but it's pale compared to the Infinity's. I use a red ARC LS as a rugged key chain light (tougher than a photon and comparably bight.
The Infinity is the ultimate carry-it-and-forget-it light. With that phenomenal battery life it is the last word in back-up lights.
Posted on Nov 17, 2001, 8:16 PM from IP address 22.214.171.124