tiny review: Led Lenser P7.2

Use the info CRX posted here: LEDs & OTHER STUFF - (Reference)

I’d say that unless the LED measures 5mm long on one side it’s an XP-G2. The die size appears to be too large for an XP-E2 and the little mark in the corner is a square, not a circle like the XM-L2 has.

Thanks for sharing that! I am a flashaholic but have never really been mechanically inclined like my Uncle/Cousin/Brother[engineers] and like a lot guys on here who can take these lights apart and modify them!

I can take many of my lights apart[smaller/midsize ones]…then have no clue as to how to improve them! :~

Why does it seem to me visually that the guts of this led lenser appears to be like a garbage $2 flashlight? So unesthetic when compared to flashlights like sunwayman, fenix etc let alone the spik sk68/clones.

Disclaimer: I have no knowledge in circuitry/electronics.

The flashlight is DD w/ resistors because it’s meant to be run on crap cells purchased at supermarkets. This is probably the most sane way to extract the level of performance they do without increasing the risk of leaking cells. The alternative would be a 2s2p carrier and a boost driver - almost guaranteed to cause cells to leak, especially once people realized that they could leave two spaces on the carrier empty (causing double the current draw from the remaining cells).

From what I’ve seen and heard the build quality is around or above the level of a good Convoy, consistency is very high, and engineering is superior. Fit and finish should be in the “very good” range. Take a closer look at the pictures - the battery carrier appears to be in a whole separate league from the stuff you are comparing the light to. The switch is a 3-stage or 2.5-stage or whatever forward clicky! Limiting resistors at the tailcap seem to be something “big,” like 1210 - especially considering how low current this thing is. Very conservative (eg safe/reliable) component sizing! I can’t see what size those 2R4’s are but I think they are even bigger. The MCPCB is copper, although who knows whether it’s DTP. Maybe M4D M4X could do a quick electrical test for us - probe for continuity from the overflow pad on the side of the LED VS the copper portion of the MCPCB. Also + and - connections to the MCPCB are done with tabs so that they can get the blanking plate really low.

Aesthetics are a matter of perspective, but LED Lenser’s style is not my favorite one either.

If you get a chance to hold one of these things in hand you’ll probably feel a little bit embarrassed for some of your other lights. I know that’s how it works for me. Don’t worry: turning it on and seeing the conservative output will help ameliorate those feelings.

it’s a simple light but imho very good made!

I measured 3,4mm in square at the LED

and Amps :
LOW 0,087 A
HIGH 0,95 A
TURBO 1,86 A

with good used eneloop

So I think it’s a Cree XP-G2 LED.

Can you measure electrical resistance between the exposed copper of the MCPCB and the little overflow pad next to the LED? I’m talking about the pad between “2012523” and the LED, not the + or - pad.

Nice review. Judging by the die size in the pictures, the led does indeed look like XP-G2.
These are available from Fasttech for ~$33, but I do not know if they are genuine or not. Fasttech has photoshopped branding off the pictures for some reason.

nvm

sorry - I forgot to write it above (had to bath the baby)

yes - it’s DTP!

i fully charged my white eneloops and meassured again:

LOW 0,22 A
HIGH 1,4 A
TURBO 2,6 A

my meter gives 30 kLux @1m 8)
the zeusray reads ~10 kLux

What is the lux output of one of these?

do you mean Lumens?

since I have no light box I could only ceilingbounce…
but with which light to compare? :wink:

No - lux or kcd measurement. This records degree of lumen concentration, or its beam hotspot intensity. Tells us how good a thrower it is.

How does its long distance throw compare with the $8 cheapie you have?

what’s wrong with that post?

That is quite a lux increase for something off the shelf, stock and runs on AAA batteries that you could give to anybody to use safely. And it’s still pocket friendly too.

And I can vouch, the tactile quality, fit & finish on Lensers is superb.

Retail price I agree is a tad high, although in the UK a new genuine P7.2 is slightly cheaper than an 2AA EagleTac D25 so isn’t so uncompetative as some make out.

I’d love to see how this light handles a 26650

Nice! I’m not really surprised, they seem to love over-engineering these lights.

Hmm. I think we can all guess pretty well how it would be handled. DTP copper MCPCB, decent little pill, DD with limiting resistors, etc… should be pretty predictable, right? No LVP though. :-\

I don’t think a 26650 is possible. I have a similar light at home (POP lite T34), which is very similar to the original Led Lenser P7, but runs an XP-E instead of the XR-E found in the Lenser.

It uses the same 4AAA carrier and same size body. And it’s just a mm or so too narrow to accept a 26650. I think you’d also struggle with length too. And if I recall correctly, the battery carrier has the + and - terminals on it, it doesn’t pass the - through the body. So you’d need a li-ion in a carrier too.

26650 is to large for the body, a 25500 will fit perfectly

Im about to mod mine, i’m looking at installing a clicky button into the bottom along with a proper driver pill in the head, something like this gear from FF

http://www.fasttech.com/products/1420/10000432/1046602-25500-37v-5500mah-rechargeable-lithium-battery-1-p

http://www.fasttech.com/products/1610/10007065/1576100-clicky-switch-for-1-aa-1-18650-led-flashlight

http://www.fasttech.com/products/1612/10001686/1122401-4-amc7135-2-group-3-5-modes-led-flashlight-driver

How is the heat with that resister bypass, does the light get really hot at 2600mah? I might rip mine apart now and do this myself

Also I tested the battery carriage and that outputs 5v, changing the resister in the pill wouldn’t that over volt the LED, would be safer to alter the battery carriage so boost mode was on constantly

EDIT: I just ripped mine apart then, pill is 21.5mm, one could easily fit a regulated booster power supply to this thing, bypass the resisters in the tail, alter the carrier to run series and parallel giving you 3v with long run time, there is many possibilities even when using the AAA setup.

A friend just bought a Lenser P7.2 for his bike and asked me to bring some of my cheapie lights for a comparison. Funny enough it was one the same as the Zeusray that impressed him as it has a similar flood pattern but outlasted it in run time when left on side by side. He can’t believe the performance for the price so I can see him buying a couple. Of course the Lenser is in a different league when it comes to build quality.