Updated with info on XR-E EZ900 v. EZ1000.
Thanks to you Scaru for the time you spent on this, and to everyone else who contributed. For me being a newbie this is a great reference for learning and purchase decisions.
“Bump to ask if there are nay other LEDs I should add. It currently has XP-G, XP-G2, XM-L, XM-L2, XP-E, and I’m doing XP-E2 right now. ”
SSC P4, used a lot of those.
Osram Golden Dragon / Diamond Dragon
Luxeon Rebel / Rebel ES
Nichia GS
edit
just read post 70 and 71 about the Osram.
also wanted:
Nichia A versus B
Luxeon PC Rebels, versus ordinary Rebels
(or a pointer to a more recent list of LEDs with pictures if there’s another one somewhere, I vaguely recall another …??)
Thank you for very useful infor. I’m using XM-L with 500 lumens. I want to change to XHP70. 
Summary:
Cree
XR-E: oldest - 7.0x7.0 - 1.0x1.0 - 1mm2 - 56-114 lm
XP-E: 2008 - 3.45x3.45 - 1.0x1.0 - 1.0mm2 - 80-306 lm
XP-G: ??? - 3.45x3.45 - 1.4x.14 - 1.96mm2 115-573 lm
XM-L: 2010 - 5.0x5.0 - 2.0x2.0 - 4mm2 - 200-1105 lm
XM-L2: 2012 - 5.0x5.0 - 2.0x2.0 - 4mm2 - 186-1193 lm
XP-G2: 2012 - 3.45x3.45 - 1.4x.14 - 1.96mm2 - 113-558 lm
XP-E2: 2012 - 3.45x3.45 - 1.0x1.0 - 1.0mm2 - 78-329 lm
MC-E: ??? - 4x 1.0x1.0 mm - 16mm2 - 280-1085 lm
MT-G2: 2012 - 9.1x9.1mm - - 506-920 lm
Luminus
SST-40-W: 1000lm
SST-50: ??? - 7.3x9.0mm - 2.2x2.2mm - 5mm2 - 275-1890 lm
SST-90: ??? - 10.0x11.0mm - 3.0x3.0 mm - 9mm2 - 600-3915 lm
SBT-90: ? -? - 2000 lm
CBT-90: ? -? - 2400 lm
CBT-140: ? -? - 3800 lm
SeoulSemiConductors
SSC-P7: 2008 - 4x 1.0x1.0 mm - 16mm2 - 251-1100 lm
Nichia
219: 70-512 lm
Hi
This may be a stupid question, but can someone refer me to the comparison between the various LEDs by luminous efficacy. I want to see which are more efficient ( provide most lumens per watt of power fed to them). I know i am oversimplifying it, but ultimately i’d like to figure out a rough comparison which lights (which emitters) will stay on longer fed by the same batteries, all other things being equal.
The tables on first page seem to show a lof of data to this extent at different currents but they don’t always list what the voltage is, so not sure how to get the watts. Can someone clarify or refer to a different source?
thanks!
Cloud
The efficiency of your lights is largely dependent on your driver’s efficiency. The efficiency per watt of the LED is less than half the story. Amc7135 drivers burn off the excess voltage and maintain constant current meaning that an S2+ with two different emitters (ex: a 3v xhp 50.2 and a 219b) will drain the battery at the same rate, but the 50.2 will be brighter.
If you’re using a constant current switching driver which converts the battery voltage to the LED voltage, efficiency will be much higher most of the time.
Yes! I too am very keen on finding a power efficiency chart for the most common modern emitters. Like for example: what’s the difference in power draw on the standardized flashlight, (same reflector and driver) between sfp40 and xhp50.2 emitting 1000, 1500, 2000 etc. lumen.
This would be very useful info to have if you want to find a sustainable lumen and a specific battery life for a specific “flashlight chassis”.
I have seen individual charts here, but no-one seems to have collected the data and made a comparison.