This is my go to head lamp when I need the power of the Sun to light my way on those tough technical trails without the weight of a large 4xAA battery light. I use Lithium Ion batteries in it which last a lot longer and are 50% brighter than regular batteries.

Voltage regulator is excellent. Comfortable fit. Unless you're into some serious caving or otherwise need an extremely rugged and bright unit, the Quad is the way to go. Dropped it into moving water on several occasions. Never had an issue. Peace.

Simple lightweight design great for running at night and doesn't bounce, rain proof/impact resistant, the four 5mm LEDs are bright and provide a wide beam so you don't have that tunnel vision feeling some headlights make, long battery life/easy battery change. Great buy.

Good quality, lightweight headlamp. Is actually very bright, even on low. Battery conservation is excellent as well as brightness efficiency. The regulated battery circuitry makes the light burn as bright for as long as the battery has more than 20% left of it's juice. So, expect this headlight to burn bright for 120 hours of the entire 150 hour battery lifetime. A very good headlamp from Princeton Tec!

I really like this light. I bought one for my wife, liked it so much I bought one for myself, loved it so much I bought one for Christmas presents! It is comvertable on the head, is good for running, it doesn't bounce all over the place on your head. It is barely bright enough for trail running and no where near bright enough for mountain biking. However, for around camp, running on smooth relatively smooth trails, seeing in the dark, reading, etc. this light cannot be beat. Batteries last well also. I have owned two other name brand headlamps, and they were not as good as this one. Would have given 5 stars if it were a little brighter, although I haven't had a better one!

This is a good all around lamp. It may not be the brightest or the most versitile, but it is a good buy. Everyone needs a headlamp and this is a good one to start with.

There are certainly lights that weigh less, more rugged, brighter, or that are more comfortable, but its highly unlikely they will be in the same package for such a low price. This light can take some abuse if it manages to somehow come off your head. All around a spectacular light at a relatively low price. No complaints to date.

Oct. 2009
Used the P.T. Quad to climb Rainier in Sept. Lit up the stage the whole time. You need a BRIGHT light to see footsteps and crevasses and the Quad worked well. Super easy to use, lightweight, and solid. Didnt get to test out the waterproof-ness, but the construction of the lamp seems sturdy. Great lamp for a cheap price.

Great light; light weight and bright. Just what you need to keep your hands free... setting up camp much easier now! Only 4 out of 5 because need to see how it holds out at Philmont in July! Expect it to work well.

Pros: Bright, 4 modes, reasonable price

Cons: adjustments are in clicks, and sometimes an angle thats on the click would be perfect

Decent headlamp, works well and the battery life is solid for 3 AAA. Im doubting the 150 hours, and the first 10 hours are very bright, then the rest of them are kind of middling. As stated in other reviews, this is a solid pick at this price point.