Petzl Myo RXP - review.

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29. September 2005
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If it is avalible in Poland, so it should be avalible in Germany too...

These year Petzl move his lazy corporate ass earlier and we have new headlamp available in December, not in January. :daumen:

So, the good old Myo XP revision 3 looks like that :
myorxpgx2.jpg


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

So what they change inside ??
myorxpinsideeh1.jpg


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 Myobelt XP that I get yesterday, there was only T2 star.
myorxpinside2zt5.jpg


Some closer look on the PCB :
myorxppcbul8.jpg


After removing some glue we have a winner of this content :
myorxppcb2uq9.jpg


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

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

From brand new batteries :
Code:
        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 freshly charged NIMH’s
Code:
        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%

Only 16% difference in led power in the boost and highest mode and almost no difference in lower modes. 700+ mA :daumen: in high mode looks quite impressing compared to almost 300 mA that you can remember from Myo XP. According to the manual - high mode (default 10 - 140 lumens) is unregulated, mid (default 6 - 51 lumens) and low (default 4 - 25 lumens) are regulated.

Ok, now some beam shots Myo RXP vs Myo XP :D

On high
rxpvsxphighum6.jpg

On mid
rxpvsxpmidqo8.jpg

On low
rxpvsxpmidce5.jpg
 
According to Petzl manual :
Code:
Level Brightness  Range  Time*   Time**  Reg.
1     8   lumen   23 m   35 h    95 h     +
2     13  lumen   28 m   22 h    70 h     +
3     17  lumen   39 m   16 h    65 h     +
4     25  lumen   45 m   10 h    60 h     +
5     34  lumen   56 m   4  h    58 h     +
6     51  lumen   60 m   3  h    56 h     +
7     59  lumen   64 m   2  h    55 h     +
8     71  lumen   72 m   1  h    54 h     +
9     85  lumen   77 m   ?  h    52 h     no
10    140 lumen   97 m   ?  h    50 h     no
Boost 160 lumen
*Regulated lighting
** Total battery life

Yes, the heatsink is to small for apropriate heat dispersion.
 
You missunderstod me.
I ment, when does the lamp switch to a lower level because of the temperature of the LED chip is too high?
 
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