The dreaded question! How many real lumens?

Gliderguy

Newly Enlightened
Joined
Nov 8, 2004
Messages
75
Location
Prescott, AZ
For a S/S LD01 on max with E2 lithium? After comparing it to an unmodified Peak Carribean, Neo Amilite T3 with upgraded emitter and a P2D rebel 100 on various levels, I estimate about 45 +/- 5 real lumens. This is after going to the lightbox measurments on flashlightreviews.com and looking at the recent integrating sphere test thread.

To think that maybe 4 years ago this was cutting edge territory for a single cell CR123 is pretty amazing to me.

Discussion?
 

Gliderguy

Newly Enlightened
Joined
Nov 8, 2004
Messages
75
Location
Prescott, AZ
80 claimed maximum lumens. Seems like fenix is only about 15% or so optimistic if the rebel 100 and q5 P2D's get 140-150 measured lumens from a claimed 175 or 180.
maybe 55-60 lumens OTF. I think chevrofreak estimated low 60s on L0D, which is almost the same light.
 

Marduke

Flashaholic
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Jun 19, 2007
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10,110
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Huntsville, AL
80 claimed maximum lumens. Seems like fenix is only about 15% or so optimistic if the rebel 100 and q5 P2D's get 140-150 measured lumens from a claimed 175 or 180.
maybe 55-60 lumens OTF. I think chevrofreak estimated low 60s on L0D, which is almost the same light.


Fenix uses a mix of emitter and OTF specs as they appear to be in transition between them.
 

LEDninja

Flashlight Enthusiast
Joined
Jun 15, 2005
Messages
4,896
Location
Hamilton Canada
Flashlight reviews got 33.8(*1.39)=~47 lumens OTF off a 1st gen L0D CE
http://flashlightreviews.com/reviews/fenix_l0dce.htm

Fenix specs
1st gen L0D CE - 50 lumens
L0D Q4 - 75 lumens
LD01 - 80 lumens

So my OTF estimate
L0D Q4 75*47/50=~70 lumens
LD01 80*47/50=~75 lumens

Note that with production variations in LED, LED vf, circuit boards etc you will get +-10% of any stated value.

So my revised OTF estimate
L0D Q4 63 to 70 lumens
LD01 67.5 to 82.5 lumens

I would use the lower number and be 'pleasantly surprised' if I get more.
 
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