38DD: Evaluation of a Titanium Pendant Light

I got this latest development from MP. I'm glad Steve has taken my evaluation into consideration.

ss20100828010948.jpg




kaichu dento said:
I like the idea of a minimal number of vertical grooves and almost wish it could be more of a wave to keep the surface smooth, but still with enough thickness change to keep good purchase when being turned.

For that matter, assuming silky smooth threads, I don't mind the idea of no grooves at all, but just a little fish tail swell at the end to make it easy to hold between your lips or teeth. The present design looks to be designed to pop right out of my mouth and I know all the rest of you hold your Drakes and Dracos in your mouth too.
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lol no I don't hold my Drake in my mouth... I'm afraid of someone smacking my back and making me gulp it down.


JHanko said:
Looks like a neat little light. :thumbsup: From what I see so far, I have to assume you're using a force sensitive resistor to control the driver current (the harder the battery presses the light engine, the brighter the LED). But then again, it could be something completely different, but I can't imagine anything else fitting into that small of a space. Looking forward to the details and the finished product. Keep up the good work...
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:wave: Jeff, you're right about the force sensitive factor AND something completely different.
 
Zeruel said:
I got this latest development from MP. I'm glad Steve has taken my evaluation into consideration.

ss20100828010948.jpg
Click to expand...

That design looks like it will work great! The slots will add for the ability to grip the light.

Maybe, for people who want to hold it in their mouths, just add a simple groove towards the middle, about 2-3mm after the trit slots.

~Brian
 
In my opinion this thing has huge potential, however if it's only available in titanium it will limit the potential market significantly: not everyone likes or can afford titanium!

Other than that it looks great, and it could even dethrone my LF2XT (if it has some sort of over-discharge protection).
 
I also agree, that having an aluminium option is good, its what I would prefer. when I heard this was was meant to be 'direct drive', I sort of lost interest. The variable output levels is great (sounds awfully similar to the planned VBC Lummi wee). I'd be up for one, if price is right
 
This light has certain got my interest... I've got a few questions, hopefully you could answer zeruel.

-What is the run-time like on high? How hot does it getting running on high?

-Run-time on the lowest setting (I know this might be hard to do)

-How many rotations does it take to go from lowest setting to high -> how does it feel going from lowest to high? Is it hard to differentiate the 'in between' ranges

-How many rotations from off (with no chance of thread play turning it on), until it actually falls off?
 
kaichu dento said:
Huh!?! That's why it's attached to a lanyard dummy - swallow the light, pull it back out! :sick2:
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Looks like I have to lube more than the threads....


JHanko said:
What do I win? :clap:
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I have a new ramping EX10 en route to me, you want it?


hazna said:
-What is the run-time like on high? How hot does it getting running on high?
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According to Steve, the runtime on max could be 20 mins or less. It's not hot on the aluminum prototype. I've not tested the runtime myself since I'd prefer to kill an unprotected 10180 on the final version. 😗

hazna said:
-Run-time on the lowest setting (I know this might be hard to do)
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The lowest setting glows like trits. Could take days. I have accidentally left it on the previous night probably at about 10-20% of the maximum output and didn't find out it's on until the next night, it was still running then... 😱oo:

hazna said:
-How many rotations does it take to go from lowest setting to high -> how does it feel going from lowest to high? Is it hard to differentiate the 'in between' ranges
Click to expand...
Maybe about a quarter to half. Feels like activating a dimmer switch. If you look at the first post, you'll see the shots of the 'in between' ranges.

hazna said:
-How many rotations from off (with no chance of thread play turning it on), until it actually falls off?
Click to expand...
5 full rotations. ie 5 x 360º

Note that this is only a prototype so whatever information I've provided here might become irrelevant if the final one has refinement done to it.

img0030cl.jpg

MiNi 123 using 16340, MiNi C2 using 15270, 38DD

hand2d.jpg
 
Last edited:
Just to see if you're paying attention, compasillo. :nana:
Yeah, should be 360º. Updated.
 
JHanko said:
Looks like a neat little light. :thumbsup: From what I see so far, I have to assume you're using a force sensitive resistor to control the driver current (the harder the battery presses the light engine, the brighter the LED). But then again, it could be something completely different, but I can't imagine anything else fitting into that small of a space. Looking forward to the details and the finished product. Keep up the good work...
Click to expand...

It's official. The variable element is called Quantum Tunnelling Composite (QTC).

Excerpt from Wiki:

Quantum tunnelling composites (or QTCs) are composite materials of metals and non-conducting elastomeric binder, used as pressure sensors. They utilise quantum tunnelling: without pressure, the conductive elements are too far apart to conduct electricity; when pressure is applied, they move closer and electrons can tunnel through the insulator. The effect is far more pronounced than would be expected from classical (non-quantum) effects alone, as classical electrical resistance is linear (proportional to distance), while quantum tunnelling is exponential with decreasing distance, allowing the resistance to change by a factor of up to 1012 between pressured and unpressured states.
 
Zeruel, possibly you can give your opinion on TIR vs. smooth if you've had a chance to evaluate both. Do you have any comparison shots of the two options? I blindly chose the smooth for fear the TIR could be too narrow of a beam for me. Do you have any input concerning the differences in the smooth vs TIR? Beam width, donut holes, efficiency, your personel preference etc. Any additional information would be appreciated.

thanks,
 
Zeruel: any chance a fellow sg-ean can see the light 😀 ??

I'm in for one of these when it's ready!
 
maskman said:
Zeruel, possibly you can give your opinion on TIR vs. smooth if you've had a chance to evaluate both. Do you have any comparison shots of the two options? I blindly chose the smooth for fear the TIR could be too narrow of a beam for me. Do you have any input concerning the differences in the smooth vs TIR? Beam width, donut holes, efficiency, your personel preference etc. Any additional information would be appreciated.

thanks,
Click to expand...

Maskman, the smooth beam profile you saw on the first post was projected by the spot TIR optic and I was given only that option to evaluate. It has no donut holes and in terms of of efficiency, both are the same because the difference is in the optic, not the emitter or LE. But from what I'm told, the profile for smooth TIR is even flood with no hotspot, I guess it's like an aspheric in a small light (not the type that projects emitter outline).


hyperloop said:
Zeruel: any chance a fellow sg-ean can see the light 😀 ??
Click to expand...

I'll need to do a background check, interview your family, ask your pet dog some questions and for you to sign a NDA. 🙄
Checking it out is possible, probably during another local outing.
 
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