Light-Test.info

Petzl MYO RXPPetzl Myo RXP - review of one of the strongest headlamp on the market in the up to 100$ category.

Hello boys and girls charismas is coming so you need to know that to buy for a present ? These year Petzl move his lazy corporate ass earlier and we have new headlamp available in December, not in January.

 

So, the good old Myo XP revision 3 looks like that :

Price : from 75 to 105$ (Christmas deals ;-) )
Lumen output : up to 140 lumens for 3 hours.
Weight : 172 g with the batteries

From outside, they only change the color, again… But there is nice orange inscription over the collimator “Regulated – Programable” oh yeah !

So what they change inside ??

Good old temperature-sensitive resistor in the foreground, but in the background there are some mayor changes.

 

Nothing unexpected, the SSC P4 U1SW0H star, also better than in Myobelt XP that I get yesterday, there was only T2 star.

 

Some closer look on the PCB :

After removing some glue we have a winner the content for the new MYO XP driver:

4K FLASH 256B SRAM 20SSOP Cypress Semiconductor CY8C24123A-24PVXI microcontroller .
http://download.cypress.com.edgesuite.net/design_resources/datasheets/contents/cy8c24223a_8.pdf

Power supply

So when we know what is inside, how it works ? Quite good I must to admit, but check yourself :

From the brand new batteries :

        V-in   I-In     P-In   V-led  I-led    P-led  Eff. 
high    3,65   0,8215   3,00   3,28   0,8458   2,77   92,5%
mid     4,28   0,3095   1,32   3,06   0,3086   0,91   69,0%
low     4,44   0,1709   0,76   2,96   0,1640   0,46   61,2%
boost   3,63   0,8522   3,09   3,29   0,8608   2,83   91,5%

From the freshly charged NIMH's:

        V-in   I-In     P-In   V-led  I-led    P-led  Eff. 
high    3,50   0,7431   2,60   3,25   0,7183   2,33   89,8%
mid     3,84   0,3070   1,18   3,05   0,3026   0,92   78,3%
low     3,97   0,1590   0,63   2,96   0,1593   0,47   74,7%
boost   3,45   0,7562   2,61   3,26   0,7483   2,44   93,5%

According to the manual - high mode (default 10 - 140 lumens) is not regulated, mid mode (default 6 - 51 lumens) and low (default 4 - 25 lumens) are fully regulated.

Now i have nice information for all clickig maniacs - for each of the 3 modes you can chose one from the 10 preprogrammed levels 1-8 are regulated (8-71 lumens), 9 and 10 without regulation (85 i 140 lumens).

mode light output range time* time**

1   8   lumens   23 m   35 hrs. 95 hrs. 
2   13  lumens   28 m   22 hrs. 70 hrs. 
3   17  lumens   39 m   16 hrs. 65 hrs. 
4   25  lumens   45 m   10 hrs. 60 hrs. 
5   34  lumens   56 m   4  hrs. 58 hrs. 
6   51  lumens   60 m   3  hrs. 56 hrs. 
7   59  lumens   64 m   2  hrs. 55 hrs. 
8   71  lumens   72 m   1  hrs. 54 hrs. 
9   85  lumens   77 m   ?  hrs. 52 hrs. 
10  140 lumens   97 m   ?  hrs. 50 hrs. 
Boost 160 lumens - with the button pressed. 
*time after which the headlamp switch to economy mode
** total burn time

For the first time Petzl had introduced the headlamp that actually works properly witch the NiMH rechargeable batteries. Only 16% difference in led power in the boost and highest mode and almost no difference in lower modes. 700+ mA in high mode looks quite impressing compared to almost 300 mA that you can remember from Myo XP. Obviously it will shorten the burn time but this headlamp can provide enough light to fool around in the mountains / forests.

How it light ?

Ok, now some your favorite beamshots ;) Myo RXP vs Myo XP ’08

on high

on mid

on low

Summary

It works with the rechargeable batteries, gives much more light in comparision to its predecessors plus the possibility of the individual configuration of each mode… Currently Myo RXP can be as the best headlamp powered from the 3AA cells on the market. It will for certain stay in my private collection for a few years :).