Quick Aleph Question

[skalomax]

Just a quick dumb question.

The Aleph 1, PR Head, and PR-T Head all the same?

They all use the McR27mm Right?


No Performance difference?


Thanks

 

[jch79]

Skalo,

See this thread McLux PR vs. PR-T. for an old discussion between the two heads. 🙂

Also, from the FAQ: E-Series Compatible Parts:

The McLux lights were customisable in a similar matter to the Aleph Series albeit on a less advanced level … meaning you could choose your driver, LED and battery configuaration but couldn’t have a 2-stage, LE and so on.

- McLux PR Head: a bigger head with a 27mm Pelican Reflector (“PR”) that is similar to the newer and better McR-27
- McLux PR-T Head: a trimmed down PR Head for applications with less need for heatsinking, otherwise the same (Don claims the “T” stands for “trimmed”, but we all know it means “Turbo”, of course )

Basically, they all use the same reflector.. the A1 head has the advantage of being able to put & swap LE's, and the PR-T apparently has the advantage over the PR as far as heatsinking goes. :shrug:

Hope that helps!
john

 

[skalomax]

:thinking: Thanks!

So the you can't change the LE's In the PR Head?



I think the PR head looks the best out of the three.

 

[jch79]

So the you can't change the LE's In the PR Head?

That's what I gathered from the info above.. maybe one of the old-timers can chime in here! :nana:

:devil: john

 

[Nebula]

John - Not an old timer here (at least on CPF), but I will try to help. I don't think that you can use the Aleph LE with these heads. My PR head has a "floor" made of aluminum. The emitter sits on top and the board sits below (connected via wires through a small hole. The "floor" acts as a heatsink while the board is encased in an e-can type arrangement that is held in by a screw.

As to the reflector - I understand that the PR head used the Pelican reflector, ergo the "PR" in the name. The PR-T head is a smaller profile "evolution" of the PR head. The PR-T ("trim " IIRC) uses the McR27 reflector. This reflector is the flat version of the 27 series.

Hope this helped somewhat. Good luck.

Kirk

That's what I gathered from the info above.. maybe one of the old-timers can chime in here! :nana:

:devil: john

 

[Kiessling]

The LE system was introduced with the McLuxII-Aleph line and abandoned with the current McLuxIII generation.
This means that the only McGizmo lights that do accept LEs are the Aleph heads ... like the Aleph1 head.

The McLux-PR and -PR/T heads are McLuxI heads of the initial McLux Series and are bulk heads that do not accept LEs. They have the emitter and converter permanently mounted. The only difference between those is the mass for heat-sinking and the look.

All three heads you mentioned ... meaning the Aleph1, PR and PR/T do use the McR27 so the beam profile is identical.

The obvious difference is the use of the Aleph LE in the Aleph1 head, but depending on your desired application, the heat dissipation capabilities might be of interest. The PR is obviously best, followed by the PR/T and then the Aleph1 that has the LE's threads in the thermal path.
For our usual applications this isn't of much concern, but imagine a LuxV driven at 1Amp ... :devil:

bernie

 

[Nebula]

Bernie - Thank you for the explanation - much better than my lame attempt 😱.

Your comments are very helpful as I just recently acquired the PR and Aleph 1 heads and have been considering mod options for these lights.

Thanks.

Kirk

The LE system was introduced with the McLuxII-Aleph line and abandoned with the current McLuxIII generation.
This means that the only McGizmo lights that do accept LEs are the Aleph heads ... like the Aleph1 head.

The McLux-PR and -PR/T heads are McLuxI heads of the initial McLux Series and are bulk heads that do not accept LEs. They have the emitter and converter permanently mounted. The only difference between those is the mass for heat-sinking and the look.

All three heads you mentioned ... meaning the Aleph1, PR and PR/T do use the McR27 so the beam profile is identical.

The obvious difference is the use of the Aleph LE in the Aleph1 head, but depending on your desired application, the heat dissipation capabilities might be of interest. The PR is obviously best, followed by the PR/T and then the Aleph1 that has the LE's threads in the thermal path.
For our usual applications this isn't of much concern, but imagine a LuxV driven at 1Amp ... :devil:

bernie

 

[Kiessling]

Hey Kirk ... not that my answer added anything of worth ... but I just couldn't hold my mouth 😀 😀

 

[skalomax]

Cool, Thanks

Nebula, Kiessling, and jch79

 

[270winchester]

Hey Bernie or others who may know:

I have a PR-T head sitting around collecting dust and it's a shame, I should have an uber bright light with a hot-rod setup with it(did someone say a SSC driven at 1amp with a 27mm reflector?). where can I get the parts to build a working head/who would build it? where can I get the glass lens for it?

Nick

 

[Kiessling]

Sorry Nick, building those things isn't exactly my area expertise ... but the combo sounds nice 😀

 

[bombelman]

I just got some PR heads myself (PR-T first and now the PR !!).
Let me also add that the PR(-T) heads use a can without threads,
that you have to fasten (epoxy) to the head, below the emitter sink.

I built my PR-T head with the standard 27mm reflector and an SSC emitter.
Let me also say that I tried focussing the Cree-Emitter in this very same
McR-27 reflector (Cree ring fits into the reflector) but the focus is
horrible... 🙁 I recently got an McR-27LT, which is the longer version
of the McR-27 (well duh). Here's the fun part:
The LT can fit the PR-heads, but not without modding the head.

Here's a nice thread: http://www.candlepowerforums.com/vb/showthread.php?t=111596

 

[Darell]

Ahhh. An nice little stroll down memory lane. 😉

All the Q's have already been answered, but I'm an "old timer" now so wanted to say, "eh? What's that you said?"

Yup, before the *real* Aleph series, we glued all these together. You make your driver choice, and you stick with it. 🙂 Man, it would be fun to start off with modern components and build a hot-rod. Hmmm. Time to check stock!

 

[McGizmo]

Hey Bernie or others who may know:

I have a PR-T head sitting around collecting dust and it's a shame, I should have an uber bright light with a hot-rod setup with it(did someone say a SSC driven at 1amp with a 27mm reflector?). where can I get the parts to build a working head/who would build it? where can I get the glass lens for it?

Nick

Have you checked with the shoppe? They have the McR-27 reflectors in stock again and I would guess they would have a window and E-can. You can also get the copper disk that would shim the Seoul up into the reflector for better focal adjustment.

 

[270winchester]

Have you checked with the shoppe? They have the McR-27 reflectors in stock again and I would guess they would have a window and E-can. You can also get the copper disk that would shim the Seoul up into the reflector for better focal adjustment.

Hey Don:

so I put down an order for:
the Ecan,
McR27-Seoul,
Nexgen500
AR coated 29.3mm lens
and a bunch of the .027" copper disc

what else would I need besides the listed components? I already have the head, o-ring, LED, AA epoxy, etc

Nick