[PART 1] Official BLF GT Group Buy thread. Group buy officially closed! Lights shipping.

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Koenta
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PS2 I think there is always some airflow if you are outside walking with such a flashlight.

Nicolaas
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DB Custom wrote:
I have a 200mm convection lens from Edmunds, it lists for $135 for the glass lens alone.

Really? Now that is (a very different matter/project alltogether but) very interesting!

I’ll be PN-ing you soon. Wink

Grtz
Nico

Texas_Ace
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The lower fins can be cut a little deeper I agree, the top fin needs more meat behind it so that the heat can easily move up there and beyond, plus for strength..

TheOnlyDocc
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Working on pictures is not one of my skill but i tryed it.

It is not really straight. But i think it is going in the right direction.
For me a flashlight can not have enough cooling capabilities. Bacause my plan is to update the LED as soon as a new LED is on the market that can outperform the XHP35 in throw and output. And then every bit of extra cooling will be appreciated.

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The Miller
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I kind of agree fins are good

On the above pic, I assume the widest part of the head attaches to the finned area just above the top fin right?

Ah and Dale, I wanted to say it is very nice to have a big gun like you thinking along, reassuring Wink

Texas_Ace
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I don’t think that threads are built into the design yet for the head. As close to the shelf as possible is ideal but that will need to be balanced with final design and cost (the longer the head is the higher the cost since it uses a much larger piece of bar stock then the rest of the light).

The Miller
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I’d say work the threading in now
And have the finned area be one part for optimal heat dissipation
This way a relative short part of ALU is needed for the threading to tube to threading for top of head.
And a thinner walled tube can make the top part

For now I think version 0,5 is the one to go with.
And if we have the threading for top part worked in I can makeba nice presentation for the first manufacturer (5ar please make a same pic as at the top of the OP, this makes it so clear what we are after)

vol
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What kind of lumen output will this have?

NikolaS
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~2000~2300 lumens but here is all about throw not lumen output

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Yes I think we’ll push the XHP35hi to a safe point, 2500 lumens should be doable right?

mdeni
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2500 at least. After all this is BLF design, not a “manufacturer rating” design.

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I ran some tests yesterday on an XHP35 with some nice results. Once the cosmetic issues are put behind us I will post them up.

Basically the XHP35 seems to be tougher then people have thought in the past but there is also a point of diminishing returns naturally. If I can find the money to replace it I just might push it till it pops just to see what happens.

The rest will have to wait till later.

Oh, and the new driver is coming along nicely as well…. Innocent

vol
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I don’t think heat is going to be a factor. I love the renderings shown. I think every effort should be made to reduce weight with still thoughts toward durability.

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Koenta wrote:
Conclusion is if you have more cooling fins you have more square area of cooling to the surrounding air. I think if the cooling fins can be cut deeper. And they have a bigger diameter you will have the best result. Is it easy to do the thermal analysis again with wider cooling fins and in between the fins deeper milled (smaller diameter). PS I like the .5 style

If you read the scholarly article I posted a few pages back you will see that that is NOT all that matters.
Convection is slow and requires passive cooling to move heat away, and the spacing between fins is more important than just how many fins you can cram into one spot.
There is not going to be any active cooling or fans on the flashlight so convection needs to move the air through the fins.
Koenta
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Oh sorry I missed that scholarly. I’m not a good student Smile

But how do you arrange the convection. I thought convection can only take place in a fluid.

mdeni
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Air is a fluid.

Enderman
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Koenta wrote:
Oh sorry I missed that scholarly. I’m not a good student Smile

But how do you arrange the convection. I thought convection can only take place in a fluid.


It’s ok, you can always learn!

mdeni wrote:
Air is a fluid.

This ^^

Really easy to imagine if you put tons of fins with only 1mm space in between, even though you have lots of surface area there will barely be any airflow between the fins.
That’s why CPU coolers with tons of fins use fans to move the air through Smile

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Texas_Ace wrote:
I ran some tests yesterday on an XHP35 with some nice results. Once the cosmetic issues are put behind us I will post them up.

Basically the XHP35 seems to be tougher then people have thought in the past but there is also a point of diminishing returns naturally. If I can find the money to replace it I just might push it till it pops just to see what happens.

The rest will have to wait till later.

Oh, and the new driver is coming along nicely as well…. Innocent


So what bin XHP35 are you testing? The E4 3C seems to handle 3.11 amps at the emitter really well so far. If you need a E2 to test till it pops I can send you one! Wink

KB1428 “Live Life WOT

Texas_Ace
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KawiBoy1428 wrote:
So what bin XHP35 are you testing? The E4 3C seems to handle 3.11 amps at the emitter really well so far. If you need a E2 to test till it pops I can send you one! Wink

I could only get my hands on a low bin 90+ CRI emitter myself but if you want to send a higher bin version to pop that would give up some more data for sure.

PM inbound.

Enderman
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Are you guys gonna test XHP35 VS XHP 35 HI vs XHP 35 dedome/shaved dome?

Texas_Ace
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Enderman wrote:
Are you guys gonna test XHP35 VS XHP 35 HI vs XHP 35 dedome/shaved dome?

I will test whatever I can get my hands on. At this point that is just the C4 bin 90+ CRI HD version, I would like to test all of the above options ideally.

If I had them all I would like to do some intensity tests as well. I have an SMO L6 reflector that could be used for crude kcd testing I suppose, although it would be interesting setting it up in my normal testing location without a flashlight to drive it.

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Enderman wrote:
Really easy to imagine if you put tons of fins with only 1mm space in between, even though you have lots of surface area there will barely be any airflow between the fins. That’s why CPU coolers with tons of fins use fans to move the air through Smile

Thats why i want the finns to be ~2mm thick and 2,5-3mm space in between. This is ok aslong we are not having ultralong finns (15-20mm or so). The longest finns on the GT will be abot 5-7mm deep. So no problem with convection!

I have one question. If i understand it right the light will be having threads at 3 points (the green marked lines). Please correct me if i am wrong

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Texas_Ace
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TheOnlyDocc wrote:
Thats why i want the finns to be ~2mm thick and 2,5-3mm space in between. This is ok aslong we are not having ultralong finns (15-20mm or so). The longest finns on the GT will be abot 5-7mm deep. So no problem with convection!

I have one question. If i understand it right the light will be having threads at 3 points (the green marked lines). Please correct me if i am wrong
!https://s22.postimg.org/8tsjuu8e9/Ashampoo_Snap_2016_11_27_16h20m51s_005...!

Yes, this is correct.

DB Custom
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Nope, more threads on top for the bezel to secure the lens and reflector. Unless the reflector is going to be threaded in from inside, or a retaining ring will hold it in. Either way, still gotta have an opening large enough to fit the 120mm reflector down into the head. Wink

teacher
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Bezel will be threaded also won’t it???
```````````````````````````````````````````````````````
Edit: You beat me to it Dale….. Wink

You never know how a horse will pull until you hook him up to a heavy load./"Bear" Bryant 

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Texas_Ace
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Good catch, totally forgot about that.

Jerommel
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mdeni wrote:
Air is a fluid.
No it’s a mixture of gasses.
teacher
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No, air is considered a “fluid”. Look it up if you don’t believe it. A mind is a terrible thing to waste. Wink

You never know how a horse will pull until you hook him up to a heavy load./"Bear" Bryant 

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Jerommel
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edit:
moved up a page.

teacher
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Looks good Jerommel. Thumbs Up I’d like to see something like that in a 26650 size.

You never know how a horse will pull until you hook him up to a heavy load./"Bear" Bryant 

 .................................. "Slow is Smooth, Smooth is Fast" ...................................

       Texas Lumens Flashlights / M4D M4X Deals : sign up - save $$$$  

         Rudeness Level _ mΩ _ {width:70%} _ LightWiki _ LED Tint Chart  

      Xlamp size chart _ BatteryU _ Flashaholic? Need Professional Help???            TheOriginal _ TAB _ LightSearch _ BatterySearch _ 14500's _ DiCal 

 

                                             

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