Ganp
Enlightened
Like many others, I obtained some Seoul P7's to try, but I have only just got around to making something with one. My aim was to make
a P7 head for the Griffin (http://flashlight-forums.com/index.php/topic,6199.0.html) and keep it small enough for easy EDC.
I had tried a variety of reflectors with the P7 - several M@G reflectors, McR 27XR, McR38, and some unbranded ones. It seems that, in
general, when it is positioned behind the reflector to focus a reasonably well defined hotspot, the beam is not very smooth, but is 'ringy'
with a broad warm band around the hotspot. And the spacing between the four Led dies causes the doughnut effect too.
When defocused the beam smoothes out quite nicely to provide a good area light, but with a weak hotspot and very little throw. So little in
fact, that a single die Led such as the XR-E will easily out throw it when used with the same type reflector.
The nicest overall beam I have found so far, is when used with an McR38 reflector - a reasonable combination of throw and an even spill,
but it was just too large for this project.
So I opted to use a smaller reflector giving a flood beam for this head.
The head houses a bored out Griffin reflector and an oversize light engine with a Tri-Flupic driver wired in parallel. The head extends back
17.00mm behind the LE so that an RCR17500 or RCR14500 battery can be used with the 1x123 body tube. Just a slight, but worthwhile
improvement, over trying to feed it with a single RCR123 battery.
The Tri-Flupic this gives plenty of runtime at the lower settings, and provides the occasional extra bright flood on burst when needed.
From a fresh AW RCR17500 battery the draw is 2300mA on burst (measured at the tail).
EDIT ... Done some more checking and with some of my other RCR17500 and RCR14500 battteries the draw is just over 3000mA when first
fired up on burst, but it drops pretty quickly.
It was supposed to complement the looks of the Griffin, but it's a bit of a style victim, and it could have been a little shorter - if I had not
built the light engine first.
So here are the photo's ....
And with a SF 6P, and a cheep and cheerful DX Seoul P7 light, for size comparison.
The parallel wired Tri-Flupic and the 24.00mm diameter LE can.
The heatsink, and a jig - with P7 in place - for centering the Led on the heafsink.
Top view of jig with Led in place, and the mounted Led.
Size comparison with an Aleph fit LE, and the battery + contact spring.
It's not the smallest P7 light, and it neads some refining, but IMHO it's a reasonable compromise for size and output. It will come back
from the anodisers soon, so I will update the post with a couple more photo's and some beamshots, when I receive it. - Updated in post 8.
Thanks for looking,
Colin.
a P7 head for the Griffin (http://flashlight-forums.com/index.php/topic,6199.0.html) and keep it small enough for easy EDC.
I had tried a variety of reflectors with the P7 - several M@G reflectors, McR 27XR, McR38, and some unbranded ones. It seems that, in
general, when it is positioned behind the reflector to focus a reasonably well defined hotspot, the beam is not very smooth, but is 'ringy'
with a broad warm band around the hotspot. And the spacing between the four Led dies causes the doughnut effect too.
When defocused the beam smoothes out quite nicely to provide a good area light, but with a weak hotspot and very little throw. So little in
fact, that a single die Led such as the XR-E will easily out throw it when used with the same type reflector.
The nicest overall beam I have found so far, is when used with an McR38 reflector - a reasonable combination of throw and an even spill,
but it was just too large for this project.
So I opted to use a smaller reflector giving a flood beam for this head.
The head houses a bored out Griffin reflector and an oversize light engine with a Tri-Flupic driver wired in parallel. The head extends back
17.00mm behind the LE so that an RCR17500 or RCR14500 battery can be used with the 1x123 body tube. Just a slight, but worthwhile
improvement, over trying to feed it with a single RCR123 battery.
The Tri-Flupic this gives plenty of runtime at the lower settings, and provides the occasional extra bright flood on burst when needed.
From a fresh AW RCR17500 battery the draw is 2300mA on burst (measured at the tail).
EDIT ... Done some more checking and with some of my other RCR17500 and RCR14500 battteries the draw is just over 3000mA when first
fired up on burst, but it drops pretty quickly.
It was supposed to complement the looks of the Griffin, but it's a bit of a style victim, and it could have been a little shorter - if I had not
built the light engine first.
So here are the photo's ....
And with a SF 6P, and a cheep and cheerful DX Seoul P7 light, for size comparison.
The parallel wired Tri-Flupic and the 24.00mm diameter LE can.
The heatsink, and a jig - with P7 in place - for centering the Led on the heafsink.
Top view of jig with Led in place, and the mounted Led.
Size comparison with an Aleph fit LE, and the battery + contact spring.
It's not the smallest P7 light, and it neads some refining, but IMHO it's a reasonable compromise for size and output. It will come back
from the anodisers soon, so I will update the post with a couple more photo's and some beamshots, when I receive it. - Updated in post 8.
Thanks for looking,
Colin.
Last edited:
Seriously, I'd love one in bare Al.
.
