Just picked up a Princeton Tec EOS

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xcandrew

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Nov 16, 2003
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I stopped by REI today to see if there was anything interesting on sale. I was mainly looking for xc ski pants and running shoes, but came home with this. I had inquired about it in the LED forum two or three weeks ago, but apparently no one had seen it yet. I was just at the store the other day and it wasn't in then, so it a nice surprise to see it and I had to take one home.

I checked it out as best as I could in the well lighted store, comparing it to several other lamps by shining the lights at the ceiling and other things. The Black Diamond Zenix was on sale for $34.93. The Zenix's 1W was much dimmer and had a strong blue cast to the beam. (I also read somewhere else that there's an update called the Zenix IQ coming out soon.) For about the same price ($38.95 EOS, $39.95 Matrix2), the Matrix 2 was similar in brightness and color to the EOS, but the beam was not quite as smooth and I don't think it's regulated or has any brightness modes. The Matrix 2 runs 8-10 hours on 2 AAs vs. 2 hr regulated high/6.5 hrs run time to 1/2 lumen (how bright is that?) on high for the EOS on 3 Alkaline AAAs according to the specs. 2 hrs is my minimum requirement for a bright mode, since that's the length of my usual workouts, running or xc skiing, so the EOS passes there for me, assuming that it's bright enough for those activities. I much prefer the simple one strap self contained design of the EOS, Aurora, Tikka Plus, etc. because it easily tucks into a small pocket and is nicer for backpacking. There were two Yukon HLs on display. They are not what I want because of the price and bulkiness, but I wanted to compare their beams to the EOS. Strangely, one Yukon HL had a white beam, and the other had a strong blue cast to its beam. I think they were similar in brightness to the EOS, but I don't see the point of the Yukon HL now with the EOS except for run time maybe. The Tikka Plus and Taktikka Plus were dim, probably like the Aurora that I have already. (The non-HL Yukon's incandescent light was brightest of all that I looked at. The Myo 5's incandescent was pretty dim, but maybe the batteries were dying.)

At home, I compared the EOS to my Aurora. It is about about twice as thick as the Aurora and the package states that it weighs 3.7 oz with batteries, about an once heavier than the Aurora. Small enough for me anyway. The button is nicer than the Aurora. It clicks positively. The mode function is similar to the Aurora except that it has one instead of two flash modes. The sequence is off-high-medium-low-flash-off and if you wait more than 3 seconds, the next push will turn it off. The pivot does not use a screw hinge and it has clicks now. That's probably an improvement since I've read that the screw has come loose on some people and then it just dangles if you don't have a screwdriver. The battery compartment opens with a thumbscrew and inside you just see plastic instead of the open circuit board in the Aurora. Princeton Tec rates the light as waterproof to 1 meter.

I put new batteries into my Aurora and took them both into my back yard. The Aurora dimly lights up my back fence. The EOS looks like its good for at least two or three times the distance, able to light up a couple of my neighbors' houses. The beam has a cleanly defined bright center and a dimmer flood surrounding the center. The Aurora has a diffuse even light. On high, the EOS is very bright against my fence and the flood section is also much brighter than the Aurora on high, so it lights up the lawn much better with the beam aimed at the fence. This makes it much nicer for trail or off trail running/hiking/orienteering than the Aurora. On medium, the EOS is still much brighter against the fence than the Aurora on high, but the flood section on the grass has dimmed down to the Aurora-on-high's level. On low, the EOS is about the same as the Aurora on high in the spot on the fence, but the flood section is useless. A good reading light intensity. Many hikers say that the Aurora is adequate for hiking at night, but I have been disappointed. I think the Aurora is just good enough at a walking pace, but only for the first 45 minutes or so on fresh batteries. I know it was not meant to be compared to 10-20 watt orienteering headlamps, but I could barely move around in my O-club's night orienteering race last year with my Aurora. The EOS won't compare to the 20 watters either, but I think it will be good enough to run around with in the woods.

Other details: It can run on lithiums. The packaging says that NiCads and NiMH's can also be used, "but may result in reduced brightness in some modes due to the lower nominal voltage of these cells". I'm not a flashlight geek, so does that mean that the high mode probably won't work with rechargables keeping in mind that its regulated? The run time on medium is 9.5 hrs regulated/12.5 hrs run time. On low it's 44 hrs regulated/60 hours total.

IMG_2238.jpg


IMG_2239.jpg
 
Nice post (which should probably go in the Reviews section). I think it will work fine on rechargeables. All the modes should work. They will just be a bit dimmer is all. It's probably PWM dimmed like the Aurora even though there's a step-up converter. Try setting it on low and then waving it fast in the air. If you see a bunch of little dots instead of a continuous streak of light, that's PWM dimming.

Alkalines start out at 1.5 volts but their voltage decreases as they poop out. Well-designed equipment should keep working until the battery voltage reaches 0.9 volts or less. Rechargeables are around 1.2 volts which is in the middle of the alkaline range, i.e. the EOS will be as bright on rechargeables as it will be on alkalines that are about 50% used up. (Rechargeables stay at an almost-constant voltage til the last minute, rather than tapering off like alkalines).

Anyway, looks like a nice light. I wish they'd do a version with 3 leds like the Aurora, but with 1AA and a boost converter, instead of 3AAA. It could be even smaller than the Aurora.
 
looks great !
I'll buy one if I can find it here in the European desert ... /ubbthreads/images/graemlins/icon15.gif
bernhard
 
I picked up the Black Diamond Zenix on Friday, despite the AAA power source. Since the batteries are in a separate box mounted on the back of the head, it would be easy to swap this with an AA battery pack.

The REI that I went to didn't have the Princeton Tech EOS.

A couple of months ago, I purchased a Matrix 2 but returned it due to its pathetic beam quality, as PT simply slipped a side-emitting (SE) Luxeon bulb into their usual reflector with a orange peel texture that is not fine enough to work well with the narrow SE emission.

The Zenix is okay, using a low dome on a star and (I believe) a Carclo optic. The beam has some of the typical irregularities that seem to accompany optics (squarish hotspot off-center within the "spill"). It would be easy to swap stars and optics.

Sounds like I'll need to pick up an EOS also.
 
xcandrew: Just FYI: I took care of your accidental double-post. /ubbthreads/images/graemlins/smile.gif /ubbthreads/images/graemlins/grin.gif /ubbthreads/images/graemlins/thumbsup.gif /ubbthreads/images/graemlins/grin.gif /ubbthreads/images/graemlins/smile.gif
May be one of my last posts/acts as moderator in my present location, as I'll be moving in approximately six and a half hours.
 
I saw some at EMS in Lake Placid yesterday. I couldn't get a good look at the beam profile because of the lights in the store, but it appeared fairly bright. Nice ergonomics, and the battery cover screw is metal, and screws into a brass nut. I didn't like the flimsy o-ring type gasket, though, and it fell out when I took the battery cover off. I did like the switch. Real nice feel to it. I didn't buy one, 'cause my CC needs to cool off.
 
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Hi everybody

I just picked up a PT EOS at my local REI today for $38.95

I like it a lot. It fills my void for a Luxeon based headlamp that I was trying to fill with an ARC LSHP and one of those Nite Ize head straps that really stink because they have no elasticity to them. I like that it is regulated and used batteries that are contained inside the head of the light and not on the back. I also will only buy headlamps that have a single band around the head. I hate the ones that have the strap over the top of your head.

I like the size weight fit and feel of the EOS one thing that I found particularly interesting and maby someone could help me with is the optic.
IMAG0076.JPG

If you look closely down the hole in the center of it you can clearly see the emiter of the high dome Luxeon used in it. This leads me to believe that they are using a new optic that I have never seen befor. On my NX-05 and Phran(?) optics the hole down the center is a magnifier and all you can see is yellow. This optic is different and I really like it's beam. It has a nice hot spot in the center but still has the side spill that I need.

They come in a blister pack with the betteries allready installed and ready to go. You can turn them on inside of the packages and compair the beams of the ones in stock to cheat the Luxeon lottery. Though I have to say that of the 4 in stock all 4 had great beam coller and it was hard to choose what I thought to be the best one. Another odd finding was that all of them seemed to have to one degree or another some small scratches on the optics. It almost looked like a smudge of pain or glue but I can not get it to come off, it does not seem to affect the beam at all. In all I am verry impressed with the light and would highly recomend it to others.
 
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xcandrew said:The sequence is off-high-medium-low-flash-off and if you wait more than 3 seconds, the next push will turn it off.

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This is exactly the same as the new Petzl Myo XP behaves. Maybe they are made by the same contractor....
 
The Princeton Tec blurb on the Eos in the "What's new" section of their website says:

"The combination of a Luxeon/1 watt L.E.D. and the Princeton Tec designed optimized lens/collimator maximizes the beam by balancing long throw with flood light."

Yesterday I accidentally noticed that when I put a finger on the middle, the hot spot part of the beam remains, while if I cover the outer part of the lens, the hot spot goes away and the flood part remains. That goes with what your observation about being able to see the emmitter, I think.

I also checked all lights where I bought mine, about eight, and they all looked the same to me. The smudges that you saw, I also saw on all of the stock. They were definitely finger prints, but stained with who-knows-what. My guess is something like glue residue. I was able to get rid of it on mine with a little rubbing.

paulr commented on PWM dimming: I read about seeing pulses when swinging the light fast on the low setting with the Aurora before, but I could never see it. /ubbthreads/images/graemlins/confused.gif Oh well, it doesn't matter, I believe you.

It's been nice using it the last couple of nights. It's the brightest light that I've ever had, pretty amazing to a non-flashaholic from something that runs on 3 tiny AAAs. It was nice under the trees at a run on animal paths even, where I can get disorientated with an Aurora. For running, the weight is just about borderline for the one strap system. It bounces a bit, moving the skin on my relaxed forehead (but not if I raise my eyebrows), but it doesn't slip. Luckily, I have a pretty smooth stride and it may not be a problem, but I haven't gone on a normal length training run with it yet. It does have a horizontal slot on the plate so it would be pretty easy to rig an over-the-head-strap if necessary, maybe taking apart my old PT Solo, and buying and sewing on some velcro to make it detachable. I'll try to get by without doing that though because I like the simplicity. It has great range and should be great for nordic skiing even on high speed downhills because of the reflectivity of snow. It might even be ok for some biking. I haven't tried that yet. For reading on low, the two part beam is not quite as nice as the even light of the Aurora, but it's still pretty good.

If anyone tries this with rechargables, it would be nice to hear a report. I do a lot of 2hr workouts in the dark in the winter here in Alaska and rechargables might be cheaper than a set of alkalines every night. (Off-topic: I checked my local Walmart. Rayovac I-C3 4 position charger is ~$30 and 4 AAAs is ~$15. Total is more than the light costs, but does the price sound fair?)
 
I have tested mine on NiMh AAA their capacity is 700mA and I actually measured 2h 15min befor it droped from high to medium. 2h 45min befor it droped to low and then it continued on a gradually reducing low for the rest of the evening untill I retired to bed at about 6h. Even at the 6th hour it was dim but still pleanty of light for working around inside of the house. The hot spot still had a nice throw easily iluminating things acrost the room. I would like to get my hands on some of these optics as I feel that they are the best Luxeon optic I have seen so far.
 
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xcandrew said:...(Off-topic: I checked my local Walmart. Rayovac I-C3 4 position charger is ~$30 and 4 AAAs is ~$15. Total is more than the light costs, but does the price sound fair?)

[/ QUOTE ]

Is Rayovac making IC3 AAAs? That would be news to me.

If instead you had in mind using standard AAAs in the IC3 charger, it will slow charge them "overnight". I would pay the extra few bucks for the Maha C401FS.
 
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Lux Luthor said:Is Rayovac making IC3 AAAs?

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Yes, and they are performing very well in my headlights.

The EOS: It is very good seeing that they offer a really regulated light. I was very disappointed that the Petzl Myo does not offer this option´.
And also the EOS' spacing in between brightness settings is much better than Petzl's.

Is there any possibility to add some kind of 'beam shaper' like on the Myo?
 
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PeLu said:
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Lux Luthor said:Is Rayovac making IC3 AAAs?

[/ QUOTE ]
Yes, and they are performing very well in my headlights....

[/ QUOTE ]

Good! I've been very impressed with the IC3 system thus far. I hope they make D sized one day too.
 
I picked up an Princeton Tec EOS on Saturday on the way to a camping trip. I had just picked up the Black Diamond Zenix a week earlier thinking my headlamp problems had finally been finally solved.

When it became dark, I compared the EOS to the Zenix. The Zenix hotspot on high was in my opinion a touch brighter than the EOS hotspot on high, though slightly smaller but ...

no comparison otherwise. The EOS beam was reflector-like, with a nice round hotspot with wider round, broad spill. It may have been an illusion, but it appeared that there was a slight darker area surrounding the hotspot between it and the spill, but this wasn't a problem during use.

The brightness levels are well chosen, with no problem navigating around camp on low on the almost moon free night. Accessing the different levels is quick and easy, with the switch on top of the unit.

I like the well designed module with single strap headband. Great headlamp!

The Zenix has a somewhat artifacted squarish hotspot with not much spill. It has the Luxeon high beam with low beam offered by two bluish LEDs; you click off between high and low. The batteries are on the back of the three-strap (i.e. top and sides) headband, with a wire connecting the batteries and light. The switch, being on the underside of the light, was a bit difficult to access when worn, especially when the light was pointed at a 45 degree angle downward. The fairly thick wire annoyed me, though I was able to slide the clips around to keep it off my ear.

Get the EOS.
 
[ QUOTE ]
nonbox said:
Does the EOS come in gray or black plastic housing instead of the white color?

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I saw other colored "bezels" atleast. There were black and yellow ones in addition to the blue one you see above. Not sure if they'll offer the body in black.
 
Got an EOS, too. The instructions specifically say it's OK with Lithiums.

This thing is great! The beam configuration is pretty much ideal, and the battery life is really good. The ONLY thing I have a problem with is that it is not easily compatible with the "blade-mount" adapters for a caving helmet (most of the other PT headlamps are).
I'll be taking it caving this weekend. I'm hoping that the beam will be bright enough for main light use, at least for smaller caves. If not, it will be a great backup.
 
It's really a light gray, not white. I didn't have my white balance set correctly. Here's another view:

IMG_2245.jpg
 
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