Build Log: '43' 7xXP-G

sosemot728 · Feb 18, 2010

I think it looks like a pot plant... :sigh:

My attempt at a 40mm PCB.

7xCREE XP-G
12x M2-0.4x8mm stainless machine screws. (I think I should change my name to "M2", I use these so often)
Khatod optic
Maxflex Driver
External Switch
UCL Glass
IP68 Sealed with quad o-ring design.
35 inch^2 of finned surface area
68x59x41mm
180 Grams

What do you think?

Tidra · Feb 18, 2010

IMHO

nice but too heawy...

Cheers,
Iztok

sosemot728 · Feb 18, 2010

Tidra said:
IMHO

nice but too heawy...

Cheers,
Iztok

I thought it was reasonable... Most other 7 up lights range from 150 to 160 grams. this one has enough heat sinking to run the Led's at full power (~1.4A-1.5A)

Tidra · Feb 19, 2010

No hard feelings it is just IMHO,...
If you plan to use it on the bar, than this weight in o.k., but from my point of view I would like to run that king of light mounted on helmet and for that I would like to have lighter light.

Again IMHO,…
heat/battery consumption vs Lum,… would your eye see so much difference if you drive XP-G @ 1A or 1.4A,… is questionable… is it really worth it

Another suggestion,…
if you can provide as many fins you can (you will need them), made them thinner 1.5 – 2mm, so you cud squeeze more of them on the housing that way you will provide more heat disposable surface.

LP
Iztok

sosemot728 · Feb 19, 2010

Tidra said:
No hard feelings it is just IMHO,...
If you plan to use it on the bar, than this weight in o.k., but from my point of view I would like to run that king of light mounted on helmet and for that I would like to have lighter light.

Again IMHO,…
heat/battery consumption vs Lum,… would your eye see so much difference if you drive XP-G @ 1A or 1.4A,… is questionable… is it really worth it

Another suggestion,…
if you can provide as many fins you can (you will need them), made them thinner 1.5 – 2mm, so you cud squeeze more of them on the housing that way you will provide more heat disposable surface.

LP
Iztok

Fins are 2mm with 2mm gaps, because of their height I don't want to make them thinner.

stinky · Feb 19, 2010

Maybe you could take some weight out of the back of it and add surface area by doing something like this?

%21BkiWHc%21%21mk%7E$%28KGrHqEOKjsEsmRTM3lGBL%2875U422w%7E%7E_12.JPG

No idea how hard that would be.

sosemot728 · Feb 19, 2010

stinky said:
Maybe you could take some weight out of the back of it and add surface area by doing something like this?

No idea how hard that would be.

I sort of tried something like that. I didn't like it and it only saved 4~8grams, the back plate underside has to be flat for the oring.

Otherwise I have reduced the weight of the back plate by doing this.

sosemot728 · Feb 19, 2010

Update: Reduced size and weight, now at 170g and 40x68x59mm.

This thing is crazy skinny, but it has over 36inch^2 of finned surface area (excluding front and rear faces)

Finally have got the fins how I want them, and am looking at the brad Harrison connectors instead of a cable gland

sosemot728 · Feb 22, 2010

After going bald from the crazies. I managed to get the weight down to 160Grams! (this was my final goal for this surface area)

Removed some of the front and rear mass

Now is this light enough!?

sosemot728 · Feb 22, 2010

Saw some other light with scollop's, thought I'd try it out. I cant decide if I like it or not. Any suggestions?

jasonck08 · Feb 22, 2010

Nice.... but whats it for used for? Looks only like a flashlight head...?

sosemot728 · Feb 23, 2010

jasonck08 said:
Nice.... but whats it for used for? Looks only like a flashlight head...?

Bike light, mount is not shown. I may offer a battery compartment to turn it into a flashlight. no guarantee's tho.

1 what · Feb 23, 2010

"Bike light"..........now you have my attention.

paulr · Feb 23, 2010

This is a different project than the twin light? Are these multi-Cree clusters worth the bother compared with an SST90 or the 4-die version (forgot number) these days?

sosemot728 · Feb 23, 2010

One word, efficiency...

It is currently the most efficient led light available, although not at full power... but on mid to low settings.

Juggernaut · Feb 23, 2010

Might just be my opinion, but the "heat sink properties" are a bit overkill for bike use. I can run my Electrolumens EDC-P7 "less then 9 oz." for no more then 15 minuets before it becomes extremely uncomfortable in the hand "165+ degrees" but on a mountain bike going 10-14 mph, it not only doesn't get hot, it doesn't even get warm:twothumbs! It stays perfectly cool, even cold to the touch! The R5s etc are so efficient I can't see them getting anywhere near as hot with nearly twice the mass of material, but that is just from my experience:shrug:.

sosemot728 · Feb 23, 2010

Juggernaut said:
Might just be my opinion, but the "heat sink properties" are a bit overkill for bike use. I can run my Electrolumens EDC-P7 "less then 9 oz." for no more then 15 minuets before it becomes extremely uncomfortable in the hand "165+ degrees" but on a mountain bike going 10-14 mph, it not only doesn't get hot, it doesn't even get warm:twothumbs! It stays perfectly cool, even cold to the touch! The R5s etc are so efficient I can't see them getting anywhere near as hot with nearly twice the mass of material, but that is just from my experience:shrug:.

I had a look at your EDC-P7 it has minimal surface area for its weight. There is a difference between the two. I have designed this to have enough surface area for natural convection cooling (without movement)

Mettee · Feb 23, 2010

I like this one, I might go for one. Do you have a rough price?

sosemot728 · Feb 23, 2010

Mettee said:
I like this one, I might go for one. Do you have a rough price?

This is only a guess, but around $100AUD... Dont hold me to it tho. There is significantly more machining involved compared to the last prototype

BTW do you like it with or without the side cut things....?

Mettee · Feb 25, 2010

matthewm said:
This is only a guess, but around $100AUD... Dont hold me to it tho. There is significantly more machining involved compared to the last prototype

BTW do you like it with or without the side cut things....?

Personally I would not add the additional side cuts, I like the way it looked round, plus it would have more fin area.

Like this

Build Log: '43' 7xXP-G

Enlightened

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Newly Enlightened

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Flashlight Enthusiast

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Flashaholic

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Flashlight Enthusiast

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