3 vs 4 emitter lights which is the most efficient?

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Xyrium
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3 vs 4 emitter lights which is the most efficient?

Hey Folks,

 

I've been going through Hank, Simon, and Lumintop's multi-emitter lights a lot lately. One thing that bugs me is the heat vs output balance. I tend to wonder if one maintains a greater lumens per degree than the other within the same chassis/frame, 3 or 4 emitters? Has there been a study on this that I can eyeball? 

 

If we could get perhaps a Lumintop FW3A or KR4 using the same emitters and measure temps and lumens along a few dedicated points in the temp range, then take the same chassis/frame and install a 4 emitter setup in it and do the same, that would be perfect. The FW3A is a great light as is the KR4, and Hank's boost driver seems to be a good design, so perhaps we can find an ultimate setup that uses both, and the most efficient setup being either 3 or 4 emitters to achieve the same results. 

 

Unless it's already been done..... Smile

thefreeman
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With a regulated driver more LEDs always means higher efficiency except at low current where the efficiency of an LED decreases..
With a FET driver, not sure.

Edit : nevermind I missed the part you mentionned efficiency in relation to throw.

texas shooter
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Given the same head size. Four LED’s will give you more lumens, three LED’s will give you more throw.

jon_slider
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More LEDs that illuminate a larger area, use more power

a single LED that illuminates a smaller area, uses less power.

Wide Floody wall of light from multi LED lights, use more power than a single LED with a tighter, more focused beam.

Floody uses more power than Throwy..

More LEDs use more power because they light up a larger area.

Xyrium
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So, let's say we have a reflector that provides an equal spill and hotspot for each emitter count, is there a point in current output where 3 is as efficient as 4 emitters since we're jamming 4 emitters in the same space?

dick33
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4 emitters are more efficient than 3 at the same current, you get more lumens per watt. The resulting luminance of the surface – cundella – depends on the optic.

Xyrium
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Perhaps, but is there not a point where the emitter is now at a fixed output, but the surrounding heat is causing inefficiency? My point is being made specifically towards a scenario where either 3 or 4 emitters are in the same exact chassis. So, less cooling space between them, and around them.  So, you're disspipating more of that current in heat than in light?

BlueSwordM
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4 emitters are always more efficient than 3 emitters.

More emitters are always better in terms of efficiency with a fixed output.

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http://budgetlightforum.com/node/67401
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Xyrium
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First, congrats on 6500 posts!

 

Second, ok, seems like the consensus is that more is better, even within the same mounting space. Thanks folks.