My first mod...3D Mag P7 success!! (pics)

LEDBE
Billy Berue

Billy Berue

Newly Enlightened
Joined
Nov 18, 2005
Messages
121
Location
Marietta, GA
Nothing fancy here...been done by others many times. But I wanted something tried and tested for my first mod. Many thanks to shdwkeeper for his Mag P7 tutorial and numerous others that have posted How To's for this and other mods. I'm just running this one DD on 3x D AccuPower NiMH LSD's. I'll try a regulated version next. Anyway, here are a few pics from my project.

Everything set up and ready to get started...
p758979007-3.jpg


H22A heatsink ready for AA adhesive...
p1067662600-3.jpg


All finished...
p661314505-3.jpg


Closeup of business end...
p715973085-3.jpg



Now that was fun!

Thanks again for all of those that have gone before me in this mod. Now let the games begin...I'm ready to try a few regulated P7 Mag mods. :naughty:
 
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In retrospect, this is probably being overdriven a bit. This is an I-bin emitter w/ spec Vf of 3.25-3.50v. Freshly charged, my 3x D 10000mAH NiMH AccuEvolution register about 4.10v open circuit, and they measure about 3.7v under the load of this light. Tailcap current is around 3.25a. I haven't run this thing more than a few minutes at a time. I wonder if I'm at risk of making this P7 go :poof: ?
 
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Hi!

I have the exact same MagLite, with same LED (-I bin P7), Green MagLite 3D, H22A annodized heatsink, three Accupower LSD 10,000 D cells, artic ceramique compound and artic silver V around the heatsink. Also in Direct drive.

I've emptied the batteries multiple times in one straight run. Yeah, the MagLite will get hot, but the LED is still fine. Compared to my Mag1185 it didn't loose any brightness.

The problem with regulating these is that the input voltage at the circuit is too close to the output voltage, so you will end up with a circuit just generating heat at the start of the run and later on limiting the light output.

Also; don't forget the resistance of the Mag; the tailcap, the switch, etc.

3.25A is fine
 
Your overdrive by .25 volts is going to be fine, just remember that it's just extra heat and decreasing the efficiency of the LED.
A little birdy once whispered in my ear that he's seen P7 d Bin's run at 6v, and they were screaming.
 
I have damaged a P7 with fresh cells, the silicone resin around the emitter has turned yellow, but it still seems to work fine. I'll bet output was reduced a little, but I can't see any difference. It ran for 9~15 min. fresh off the charger.
 
Thanks, guys. Sounds like the voltage source of my particular build is reasonably well matched for DD purposes to the If/Vf characteristics of a typical I-bin P7.

Wish I had a variable PS, as the really geeky side of me would like to be able to plot my own If/Vf curves for my particular emitters. :rolleyes:
 
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As long as the emitter does not come off the heatsink it should be fine. I have one of these lights and it first had a fivemega reflector in it that I bored out to fit over the emitter. I use this light in the shop every single day, and it gets handles rough, and dropped sometimes. It's a work light. The emitter finally came unglued one day, and was damaged before I realized what happened.

Now I have a DX reflector in it that when screwed down keeps pressure on the top of the emitter so it can't come loose.

Nice light. These DD P7 Mags are real workhorses. I build them for friends a lot. Simple, tough, and not too expensive.
 
Greg G said:
As long as the emitter does not come off the heatsink it should be fine. I have one of these lights and it first had a fivemega reflector in it that I bored out to fit over the emitter. I use this light in the shop every single day, and it gets handles rough, and dropped sometimes. It's a work light. The emitter finally came unglued one day, and was damaged before I realized what happened.

Now I have a DX reflector in it that when screwed down keeps pressure on the top of the emitter so it can't come loose.

Nice light. These DD P7 Mags are real workhorses. I build them for friends a lot. Simple, tough, and not too expensive.
Click to expand...

Which reflector are you talking about? care to post a link to it? i have a few of this setup myself but with the Britelumens MOP..i think its the 15mm opening.
 
So that reflector is a good fit in a D mag? and hold the leds down? How about a beamshot?

Anyone have a good source for a P7? Was looking at the thread in the MP but seems that it may have ended. Nevermind Guess kaidomain has them. CSWOI is fine with 3D cells?

Yeah that tutorial got me wanting to build one also.
 
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I just built a basically identical light in a 2C Package with 3x SubC's...Also direct-driven P7, but i got a problem with the current, the p7 is only pulling 1,65 amps on freshly charged cells...i already measured the resistance because i'm not sure about my negative connection from led to bat -...Don't know where else to look...i'm trying to connect a different bat to see if it's a problem from the nimhs maybe..got 4000 mAh unknown brand and 5000 mAh Tenergy cells..
 
Greg G said:
Nice light. These DD P7 Mags are real workhorses. I build them for friends a lot. Simple, tough, and not too expensive.
Click to expand...

+1 :thumbsup:


Mine gets tossed around in the bottom of my work bag (in the back of the Jeep) and no issues yet! :D


choaticwhisper that refelctor will fit the Maglite head BUT you need to modify it to do so... texture smooths out the beam but obviously cuts back on the throw somewhat ;)
 
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