Petzl Myo XP questions...

NorthernStar

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Hi.

I just recently read about a coming head lamp called the Petzl Myo XP. It has not been released yet,but i know that this does not prevent that some people allready got it before release date. I have found following specs about this head lamp:


Alkaline:..........
Boost: (65m range) 20 second before reverting to previous setting
High: (45m range) 70h
Medium: (35m range) 90h
Low: (20m range) 170h
Powered by 3 x AA/MN2400 batteries (included)

Weight without batteries: 99g
Weight with batteries: 129g
b_petzl_myoxp.jpg


Could it realy be true that this head lamp that has a 3,5 Watt LED could have a burntime for up to 70(!) hours on full effect?

Compared to for example the Princeton Tec EOS that has only a burntime of about 7 hours with a 1 Wat LED,the Petzl Myo XP that is mouch more powerfull and is supposed to have 70 hours burntime.

Has anyone used the Petzl Myo XP yet? Can anyone verify the very long burntime?

Thank´s for any input.
 
[ QUOTE ]
NorthernStar said:
Hi.

I just recently read about a coming head lamp called the Petzl Myo XP. [..... snipped .....]. I have found following specs about this head lamp:


Alkaline:..........
Boost: (65m range) 20 second before reverting to previous setting
High: (45m range) 70h
Medium: (35m range) 90h
Low: (20m range) 170h
Powered by 3 x AA/MN2400 batteries (included)

Weight without batteries: 99g
Weight with batteries: 129g

[......snipped......]

Could it realy be true that this head lamp that has a 3,5 Watt LED could have a burntime for up to 70(!) hours on full effect?

[/ QUOTE ]

I believe you are right to be sceptical about the burntime claims. The XP is said to be an unregulated light, so it will get progressively dimmer as the batteries are used up. I do not know the basis of the claim that battery duration is 70 hrs on high beam. There must be some definition of a rather meagre level of light output required before the batteries are deemed to be finished. But I think it can be said with confidence that light level will have reduced greatly long before the time indicated.

If you assume that AA alkaline batteries have a capacity of 2500 mAh each, the capacity of 3 such batteries would total 11.25 watt-hours (1.5 volts x 3 batteries x 2500 mAh). So, running a Luxeon star at a steady 1 watt, the 3 batteries of the XP would be completely depleted after 11¼ hrs. Assuming constant output, the power level consistent with 70 hours battery life would be only 0.16 watts. No manufacturer can beat the laws of physics.

In addition, the weights you have quoted do not look correct---99g without batteries and 129 g with batteries. That would mean that the three batteries weighed 30 g in total. I think that the correct figure for 3 AA batteries would be about 70 g.

I am a bit surprised that Petzl are releasing what is reported to be an unregulated light. As regulated lights are becoming readily available, unregulated lights are not looking an attractive proposition.

[Slight correction to figures edited at 17:00 hrs UTC on 24 February 2005 --- Polaris].
 
Petzl has such a loyal following, people will buy whatever they put out.

LEDs have much longer run times than incans, but not really longer run times at incan levels. They run for a really long time at about 20 ma, which is plenty to read with, set up a belay, hike on a dark night, but not wow a cpfer. BD specifically states their run times are to the point you can see the bottom of your back pack.

In short, the run time for showing it off to your friends is going to be short. But when you get lost, stranded, or otherwise need light for a really long time, maybe you could get 70 hours of light out of it and be glad you had it.

As for the weight, I wouldn't put it past them to spec it out with litium batteries. That would also make the runtimes bogus.

I can't believe they are selling a 3 AA headlamp without a top strap. That thing will have to be really tight to keep it in place while doing anything physically exerting.

But the flip down diffractor lens looks cool.
 
I might be able to shed some light on your questions.
1) The weight is 100g without batteries and <font color="red">175 </font> g with Alkaline batteries (3 AA= 75g)
2) The MYO XP includes an optional top strap that can be attached to the rings/holes in the frame and battery compartment for those running with the light. Otherwise it is quite comfortable without the top strap for everyday use.
3) The light uses a 3 Watt Luxeon LED (un-regulated) in order to provide longer burn times for those people in need of light of serveral nights use. The end of battery life is determined to be when the light output falls below 0.25 LUX at 2 Meters distance. This is roughly equivilant to the light of a full moon on a clear night. See this weblink for more details:
Petzl lighting Reference

4) The key features of this new lamp are:
-the flip up/down diffuser lens which allows for both a spot and wide-angle beam pattern from the same 3 Watt LED
-the Boost option overdrives the LED momentarily (@ 20 seconds) to allow for longer beam distance/throw while protecting the LED with both an internal heat sink and thermal protective system which will kick the power back to whichever mode used prior to pressing the Boost button (momentary switch)

Hope this clarifies a few of the questions
 
I have read that this light has an open vent. Is this true? If so, then it seems the light's use in harsh conditions would be somewhat limited.
 
Thank´s for the info.
I am looking for a headlamp that will replace my Black Diamond Zenix when running. The Zenix was good,but not strong enough for running at night. Do you think that the XP is good for running?
 
RobWV-
The MYO XP does has a small slit on the bottom of the light allowing the internal heatsink to vent. This slot is 2mm wide by 7mm long. This is not a light for caving or submersible.

Northernstar,
This light will work well for running in two ways:
1) the top strap (included) can be attached to prevent the battery pack from sliding down while on technical trails.
2) also the light can be worn around the waist while running which provides better shadow detail and speed in reading terrain changes. LEDs offer such uniform light that it can flatten out our perception of changes in the trail. The lower the light angle the longer the shadows and the better the light when running on trails. The tilt angle of the light have been increase in order to accomodate the waist mount option (thus the other reason for the optional top strap).

Hope this helps,
JRoc /ubbthreads/images/graemlins/smile.gif
 
I find it interesting that they use 0.25 lux at 2 meters as a reference.

That works out to about 1 lux at 1 meter if you want to compare to other lights.

Tom
 
Northernstar,
The MYO XP will carry an IP X5 rating which means that it will be fine in rain and snow. According to the IEC standard 60529 the level 5 protection rating is defined as:
"water projected by jets against the enclosure from any diretion shall have no harmful effects."

Hope the weekend was fun!
/ubbthreads/images/graemlins/grin.gifJROC
 
made a 'review' of the Myo XP in September.
I could look for it and post a link if anybody is interested.
What I didn't like is that it is not regulated and uses an uneven number of cells.
Although the technology is already available at Petzl
 
Thank´s for the link. I see by the date that the post was written that the Petzl Myo XP was presented allready in October 2004.It looks like a great light.
 
Petzl Myo XP Wide angle lens questions..

How well does the Wide angle lens work for a flood beam..
What the light spread on the low and is it low enough to preserve some night vision?? The concept plus the flexibility are great if they work?
 
Re: Petzl Myo XP Wide angle lens questions..

I'll be posting a formal review of this light on my site within a week or so. /ubbthreads/images/graemlins/smile.gif
 
Re: Petzl Myo XP Wide angle lens questions..

[ QUOTE ]
de55jay said:What the light spread on the low and is it low enough to preserve some night vision?

[/ QUOTE ]

IMHO it is still too bright for reading at night. And the light distribution with the diffusor is perfect.
 
does light look pure white or bluish?

I have the myo 3 which the led look bluish. I wonder if the XP version has pure white. According the beamshot test. It shows to be bluish. Is this the photography effect or actual light color?
 
Re: does light look pure white or bluish?

I am hoping that they are going to come out witha a red filter/diffuser llike they ahve done with most of their other headlamps
 
Re: does light look pure white or bluish?

Which beamshot test are you referring to? I've posted shots here comparing a Myo XP to a Streamlight ProPoly 7-LED. The Myo 3 (like the old ProPoly) uses 5mm LEDs which are typically bluish-white in color. The Luxeons (like in the XP) don't have the same sort of bluish tint to it, by comparison.
 
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