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Another Malkoff Junkie Group Buy Thread (Neutral M91B)

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greatscoot

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I've been looking to pick up an M91 and missed out recently.
Some of you expressed interest in a Warm 4000K-5000K M91B.
I will reach out to Gene and see if he would put together a run if there is enough interest.

The fine print.
-This isn't necessarily a sure thing. (I think 20 would be the minimum).
-There are a lot of people here who know way more about this than I do and would like to hear a discussion on emitter choice. I am not partial to HiCri.
-I have posted a poll with a temp preference and we can discuss emitter choices separately.
 
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CREEXHP70LED

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Re: Another Malkoff Junkie Group Buy Thread (Warm M91B)

First in with the 5000K...
 

Kestrel

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Re: Another Malkoff Junkie Group Buy Thread (Warm M91B)

I would most certainly purchase either one, but I voted for 5000K.

I actually think that 4500K would be perfect; each emitter will be on one side or the other anyhow.
 

wacbzz

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Re: Another Malkoff Junkie Group Buy Thread (Warm M91B)

Just thinking out loud here, but wouldn't a warm M91 have an emitter that is at the very least in the 3000k range? And isn't that already an option? The color temps suggested seem to be neutral​ to me...
 

Grizzman

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Re: Another Malkoff Junkie Group Buy Thread (Warm M91B)

I would accept any option between 4000 and 5000.
 

thermal guy

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Re: Another Malkoff Junkie Group Buy Thread (Warm M91B)

I'd go for a 4000 k
 

archimedes

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OP, I realize this is currently an "interest thread" but if you plan to convert it to an actual Group Buy, you will need a separate post listing those signed up. It is best if this is early in the thread, ideally on the first page.

There are a number of other rules specific to GB, and it may be useful to review some of the recent successful threads for these details.

This is an interesting project, good luck !
 

tuelleric

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Would love to get one in 4000K! The current tint options are the only reason for me to hold back on the M91B. I want it to match with my neutral HD, WC and M61N. Thanks for this thread!
 

peter yetman

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........ and would like to hear a discussion on emitter choice.
Do we know what the emitter is in the regular M91B? (It's XP-L, just looked it up).
Surely if you start messing with different emitters, rather than the same emitter with a lower CT, the beam shape will be affected.

Sorry if you didn't mean to start the emitter discussion here. I can move it somewhere else if you wish.

I voted 5000k but I'd be happier with 4500k.

P
 
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greatscoot

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Do we know what the emitter is in the regular M91B?
Surely if you start messing with different emitters, rather than the same emitter with a lower CT, the beam shape will be affected.

Sorry if you didn't mean to start the emitter discussion here. I can move it somewhere else if you wish.

I voted 5000k but I'd be happier with 4500k.

P
Thanks for the input, I appreciate it.
 

ZMZ67

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I would most certainly purchase either one, but I voted for 5000K.

I actually think that 4500K would be perfect; each emitter will be on one side or the other anyhow.

Do we know what the emitter is in the regular M91B?
Surely if you start messing with different emitters, rather than the same emitter with a lower CT, the beam shape will be affected.

Sorry if you didn't mean to start the emitter discussion here. I can move it somewhere else if you wish.

I voted 5000k but I'd be happier with 4500k.

P

I voted 4000K but I also agree that 4500K would be the best. I have always been on the fence with regards to the M91 since the choice was either warm or cool but a neutral 4500K should be just right for me.
 

mckeand13

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I "might" have a 4000K XP-L M91BN and have to say it "might" be really, really nice. That said, I'm sure I'd like a 5000K as well.

How about this LED. 5000K XP-L2 90CRI U6. Lower CRI, higher bins are available, but in general, this crowd appreciates higher CRI.

https://www.mouser.com/ProductDetai...IOPpR4S5%2B3nSBSgb9IoHLoHQoR0gZbAAg4Z2CUaGOtz

I'd be game for going "backwards" to an XM-L(2) in order to avoid the goofy purple corona the XP-L series has.
 

peter yetman

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would the XM-L2 not screw up the beam pattern that everyone raves about on the XP-L?
That's a proper question, not a rhetorical one.
P
 

Random Dan

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would the XM-L2 not screw up the beam pattern that everyone raves about on the XP-L?
That's a proper question, not a rhetorical one.
P

The XP-L and XM-L series share the same die size, so focus and beam pattern should remain unchanged provided the larger XM footprint fits.
 

mckeand13

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would the XM-L2 not screw up the beam pattern that everyone raves about on the XP-L?
That's a proper question, not a rhetorical one.
P

I used to rave about the M61 XM-L when I had one so I think a little more flood would be great. Everyone's use will be different though.
 

tuelleric

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The XP-L and XM-L series share the same die size, so focus and beam pattern should remain unchanged provided the larger XM footprint fits.

M91 and M61 use the same reflector, which has a 5 mm emitter hole diameter and is optimized for a 3.45 mm x 3.45 mm LED such as XP-G and XP-L. In the original M91, the reflector sits on top of the 5 mm x 5 mm base plate of the XM-L. The beam is much broader, as the emitter is slightly out of focus. So without modifying the reflector, the beam would look different, although the emitter size is the same.

Is there actually any advantage using a XM-L over a XP-L? The only one I can think of is better heat transfer from the LED to the PCB...

For reference my original M91:

36115186yl.jpeg


And a link to the M91B frome Gene's website:
https://cdn.shopify.com/s/files/1/0931/7326/products/M91_800x.jpg?v=1441727054
 
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