Lux V vs. Cree Vs. Seoul?

[flash]

I have a maglite modded with a WWOT being driven at 800ma. When I compare this with my Fenix L2D, it doesn't seem THAT much brighter.

I know that LED efficiency is very different. But my question is...how do newer high output LEDs such as the rebels, crees and Seouls stack up against the older Luxeon V in terms of light output?

 

[WadeF]

Can Luxeon V's put out much more than 100 lumens if they are driven hard? Cree Q5's are putting out 200+ lumens, SSC's are up there too.

 

[evan9162]

The Rebel-100 and XR-E Q4 bin put out the same amount of light as a W-bin Luxeon V at a given current level. Now consider that the rebel and XR-E has a Vf that's around half of the Lux V, and you'll see that they are also twice as efficient.

 

[Supernam]

What's a Lux V? :duh2:


JK

 

[umberto]

where does the Luxeon K2 emitter fit in to the luxeon V or rebel...newer or older? brighteror dimmer?.....my Dorcy 6W uses the K2 and is very bright

 

[Pokerstud]

What's a Lux V? :duh2:


JK

A Lux V is a 5W Luxeon emitter, found in such lights as the original Surefire L4, L5 and L6

 

[yaesumofo]

The same emitter used in a SureFire KL4 head.
Known for being bright with a very wide angle beam.
The Lux V is a very cool emitter.
They were used in the old Maglight Space needle mod done by Mr Bulk.

IMHO an over lookeed emitter to be sure.
Old technology Current crop of high end emitters emit much more light at lower current and voltage.
Time marches on and so does technology.
I still like the Lux V emitter a great deal.
Yaesumofo

A Lux V is a 5W Luxeon emitter, found in such lights as the original Surefire L4, L5 and L6

 

[Lightingguy321]

The K2 in terms of output can put out a lot more light than a Lux V if driven at very high currents (they get HOT) and are not nearly as efficient as the Lux V.

 

[Bullzeyebill]

A nice low vf lux V can run very efficiently with one 17670 or 18650 using a boost converter. Have to have a very efficient buck/boost regulator to run a Cree or Seoul with one LiOn, particularly at the higher currents.

Bill

 

[evan9162]

The K2 in terms of output can put out a lot more light than a Lux V if driven at very high currents (they get HOT) and are not nearly as efficient as the Lux V.

Not true at all.

You have to drive a K2 really hard to get close to the output of a Lux V (for comparable bins). However, at a given current level (and for comparable bins), the K2 is as or more efficient than the Lux V.

Here is my test data from my LEDs. Note that The S-bin and V-bin K2s are the top bins (the V-bin performing much better). The V-bin Lux V, and U-bin K2 are merely "average".

Output (lumens):
				Current (mA)
				130	310	670	980	1260	1570	1930
----------------------------------------------------------------------------------------
Average of 2 W-bin Lux V	41	91	169	222	265
Average of 8 V-bin K2		24	54	102	135	163	187	210
Average of 5 S-bin K2		22	48	89	116	139	158	177

Average of 4 V-bin Lux V	29	64	117	152	181
Average of 2 U-bin K2		20	41	72	93	105	120	127



Efficiency (lm/W):
				Current (mA)
				130	310	670	980	1260	1570	1930
----------------------------------------------------------------------------------------
Average of 2 W-bin Lux V	56.2	49.8	40.6	35.5	32.3
Average of 8 V-bin K2		59.8	52.5	43.5	38.1	34.7	31.1	27.7
Average of 5 S-bin K2		56.3	48.4	38.9	33.6	30.3	26.8	23.7

Average of 4 V-bin Lux V	38.1	33.4	26.6	23.0	20.8
Average of 2 U-bin K2		47.9	37.1	28.1	23.8	20.5	18.4	15.7