Which drop-in is more efficent?

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garrybunk
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Which drop-in is more efficent?

Ok, confused here.  Talking strictly efficiency - most output with most runtime off identical cells.  I'm not looking for which one has more throw or more flood.  Not really looking for which one would run cooler, although input on that aspect would be appreciated as well. 

Looking at this  Dealextreme single XM-L dropin: http://www.dealextreme.com/p/cree-xml-t6-5-mode-6700k-900-lumen-smooth-aluminum-drop-in-module-with-textured-reflector-58481 versus this 6x Q5 drop-in: http://www.dealextreme.com/p/6-cree-q5-wb-5-mode-1200-lumen-white-light-drop-in-led-module-52-7mm-42mm-8-4v-max-65153
versus this 5x R2 drop-in: http://www.dealextreme.com/p/5-cree-r2-5-mode-1200-lumen-white-light-drop-in-led-module-52-7mm-42mm-8-4v-max-35242

The way I read it (assuming specs are accurate, and we all know what happens when you "assume") the 6x Q5 drop-in is rated for the most output at the lowest current draw (1200 Lumens at only 800mA).  Is this correct?

It also seems more people online are using the 5x R2 drop-in.  Why would people choose it over the 6x Q5 drop-in? 

Thanks,
Garry

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harry25175
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T6

garrybunk
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Ok, why the XM-L T6?  That one says 3 amps on high?  That's substantially higher than 800mA on high, unless I'm missing something.

Garry

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harry25175
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XML is the most efficient led currently.

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garrybunk wrote:

Ok, why the XM-L T6?  That one says 3 amps on high?  That's substantially higher than 800mA on high, unless I'm missing something.

Garry

A T6 driven at 800mA will produce more light. 

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Low driven XM-L.

garrybunk
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It's my understanding that an XM-L T6 at 800mA should produce around 350 lumens (referring to this testing: http://budgetlightforum.com/node/2603).  The 6x Q5 says 1200 lumens at 800mA.  Is the 6X Q5 pulling 800mA PER LED?  Is this where I am misunderstanding the specs?  That's not the way I read it though. 

Thanks,
Garry

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Hikelite
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The R2 needs 1000ma to produce 250lumens

Now you are comparing 1 LED vs 5 LEDs or 6 LEDs 

 

 

 

 

harry25175
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u cant compare single led with multiple leds

garrybunk
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So are the specs false?  Would the 6x Q5 drop-in be pulling a LOT more current than the "800mA @ 1200 Lumens" as stated?  I'm trying to look at the current draw of the drop-in as a whole here.  Same thing for the 5x R2 - drop-in, pulling a lot more than "1A @ 1200Lumens"?

Thanks,
Garry

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garrybunk
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Why can't I compare single vs. multiple?  Why is it so hard?

Garry

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Hikelite
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They are in series. The current draw should be 4A for the 5xR2.  Seems be be close to it.

By langedaenen

"Some data:

Current drown ( 2 fully charged 18650 )
Full brightness: 1.85A
Med brightness: 0.75A
Low brightness: 0.25A --> very long runtime :)"

garrybunk
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Hikelite, which module are your specs for?  Is that a post somewhere?  Can you provide a link?

Thanks,
Garry

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garrybunk wrote:

It's my understanding that an XM-L T6 at 800mA should produce around 350 lumens (referring to this testing: http://budgetlightforum.com/node/2603).  The 6x Q5 says 1200 lumens at 800mA.  Is the 6X Q5 pulling 800mA PER LED?  Is this where I am misunderstanding the specs?  That's not the way I read it though. 

Thanks,
Garry

Gary, thanks for this link.. I havent seen that before! very useful!!!

Hikelite
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Hikelite wrote:

They are in series. The current draw should be 4A for the 5xR2.  Seems be be close to it.

By langedaenen

"Some data:

Current drown ( 2 fully charged 18650 )
Full brightness: 1.85A
Med brightness: 0.75A
Low brightness: 0.25A --> very long runtime :)"

 

I presumed that they stated 800ma for the 5xR2 drop-in, thats why I said 4A.

E1320
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Here is the link to the efficiency of each emitter the T6 wins.

http://flashlight-wiki.com/Brightness_Bins

I am already visualizing the duct tape over your mouth.

garrybunk
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Some useful info at this link as well (1st post): http://club.dealextreme.com/forums/Forums.dx/threadid.747581.  Guess I wasn't understanding where the current draw is being  measured.  So it really is "per LED" I take it. 

Now I know I said throw vs. spill didn't matter, but any ideas? Would the 6x Q5 or 5x R2 or single XM-L module produce more flood (spill)?  Do people generally go with multiple LED's to get flood?  I know reflector plays into this a lot, but just go with these particular modules.

Thanks,
Garry

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harry25175
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are u trying to compare multiple leds with single??

 

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Garry, the most efficient drop-in you can probably make would be a true voltage regulated driver at 1.4A feeding an T6 XM-L.  Use a driver like the Nanjg 101 AK with 4*AMC7135 chips. You will have plenty of output (500-600 lumen) and the best battery life.

harry25175
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the best is to buy both.. and you will find the answer Cool

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JohnnyMac wrote:

Garry, the most efficient drop-in you can probably make would be a true voltage regulated driver at 1.4A feeding an T6 XM-L.  Use a driver like the Nanjg 101 AK with 4*AMC7135 chips. You will have plenty of output (500-600 lumen) and the best battery life.

I would recommend this also...

 

Wondering, has anyone made only 1000mA dropin with XM-L?

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So, is it possible that I could replace the driver with a 1.4amp or less (ie. 1.0amp) and drive this XM-L drop-in from 2 D sized Alkalines?  This would be ideal for me.  Common size battery, yet large D size for runtime.  +/- 400 Lumens sounds like plenty of light.  

Thoughts?

Garry

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garrybunk
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How about this driver? http://www.kaidomain.com/product/details.S009113 .  Says 0.9v - 4.2v 1000mA boost and buck current regulated 17mm diameter.  Would this be compatible with the Dealextreme XM-L drop-in and 2 alkalines?  Would the voltage cutoff of 2.75v cut off the alkalines too early? 

New to the driver scene.

Garry

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Might not be of interest any more, but here are some data on the 5*XR-E R2  and  6*XR-E Q5 drop-ins running on 2*18650:

5*R2:  light output: 820 - throw: 330m - unfortunately I didn't measure the current.

6*Q5:  light output: 850 - throw: 300m - 1.85A

Light output in arbitrary units   (roughly mimicking lumens)  measured via ceiling bounce.

garrybunk
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How about the above mentioned driver running 3 alkalines?  It says max 4.2v input and the alkalines would be 4.5 though.  Seems with alkaline C's or D's I should stay at about 1amp max.  Not sure what kind of runtime this would provide.  Any ideas?

Garry

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Hikelite
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garrybunk wrote:

How about this driver? http://www.kaidomain.com/product/details.S009113 .  Says 0.9v - 4.2v 1000mA boost and buck current regulated 17mm diameter.  Would this be compatible with the Dealextreme XM-L drop-in and 2 alkalines?  Would the voltage cutoff of 2.75v cut off the alkalines too early? 

New to the driver scene.

Garry

It's sold out for a very very long time now.

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garrybunk wrote:

How about the above mentioned driver running 3 alkalines?  It says max 4.2v input and the alkalines would be 4.5 though.  Seems with alkaline C's or D's I should stay at about 1amp max.  Not sure what kind of runtime this would provide.  Any ideas?

Garry

alkalines, seriously? that makes turning the light on cost alot....atleast look at rechargables.

Personally I'd love a light running on 2 or 3 d cell rechargeables, capable of 500 lumens for a couple of hours.

The extra width of the battery tube would mean a larger head wouldn't look quite as odd.

garrybunk
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Ok, missed it being out-of-stock.  How about a driver from elsewhere?  DX, since that's where the drop-in is coming from?  Which way would be more efficient - 2 D cell Alkalines?  or 3 C cell alkalines? 

What I am getting at is a "simple" 2D Maglite XM-L with good runtime.  I don't need the "WOW" factor out of this light.  Allowing it to be run on simple everyday alkalines is a plus.  Would consider rechargables (NiMh), however that is additional cost (both cells & a charger).  At least I could start on alkalines and move on to NiMh cells later. 

Garry

 

 

Garry

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Good efficient boost drivers (under 3.7 V) are hard to find nowadays, especially multi-mode ones.

Maybe you want to take a look at the good driver list.

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E1320 wrote:

Here is the link to the efficiency of each emitter the T6 wins.

http://flashlight-wiki.com/Brightness_Bins

Just looked at the original list and its got 40k views! Not half bad, IMO xD

Great work on Brteds end of keeping it updated and expanded : )

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