Cree LED specs

emitter type specs
LED	XR-C	XP-C	XR-E	XP-E	XP-G	MC-E	SSC P7	XM-L	SST-50	SST-90
rel. flux @ 350mA ^a	100%	100%	100%	100%	100%	100%	100%	52%	100%	100%
rel. flux @ 700mA ^a	128% @ 500mA	129% @ 500mA	169%	174%	185%	174%	174%	100%	194%	193%
rel. flux @ 1A ^a			221%	223%	248%			138%	273%	270%
rel. flux @ 1.5A					333%			195%
thermal sag @ 75°C	13.4%	14.6%	12.8%	11.8%	11.1%	11.8%	9.1%	10%	8.6%	9.6%
thermal sag @ 125°C	27%	29%	26%	24%	22%	24%	26%	21.5%	17%	19%
thermal resistance [K/W]	12	12	8	9	6	3	3	2.5	2.45	0.64
beam width FWHM [°]	90	115	90	115	125	110	130	125	100	100
die size [mm²]	0.44	0.44	0.92 ^b 0.73 ^c	0.92	1.92	4* 0.92	4* 0.92	4	5.0	9.0
virtual die size [mm²] apparent size as seen from front			2.76 ^b 2.07 ^c	1.94	3.50			8.53
max. current [A]	0.5	0.5	1.0	1.0	1.5	2.8	2.8	3.0	5.0	9.0
max. bin	P4	Q4	R2	R3	S2	M	D	U2	J	N
min. flux [lm] at max bin and max current	103	129	253	271	493	750	800	975	1365	2700
die emittance [lm/mm²] flux per die area	234	293	276 ^b 347 ^c	296	258	205	218	244	273	300 ^d
specs @ 25°C --- a) MC-E/SSC-P7: per die; SST-*: per mm² --- b) EZ1000; c) EZ900 The XR-E EZ1000 is reported to perform slightly (~1.5%) better than stated @ 1A. d) typical estimated sag is around 10%, but for SST-90 more like 20%

Cree XR-/XP- flux bins and luminous flux
bin	XR-C/XP-C	XR-C/XP-C
	XR-E/XP-E		XR-E/XP-E
	XP-G			XP-G
	350mA	500mA	1A	1A	1.5A
	100%	128%	222%	248%	333%
P2	67-74	86-94	149-164
P3	74-81	94-103	164-179
P4	81-87	103-112	179-194
Q2	87-94	112-120	194-208
Q3	94-100	120-129	208-222
Q4	100-107	129-138	222-238
Q5	107-114	138-147	238-253
R2	114-122		253-271	283-303	380-406
R3	122-130		271-289	303-322	406-433
R4	130-139			322-345	433-463
R5	139-148			345-367	463-493
S2	148-156			367-387	493-519

MC-E flux bins
bin	MC-E		each die is similar to XP-E
	1.4A	2.8A
	100%	174%
F	210-240	366-418	N2-N3
G	240-280	418-488	N3-P2
H	280-320	488-558	P2-P3
J	320-370	558-645	P4-Q2
K	370-430	645-749	Q3-Q4
M	430-490	749-854	Q5-R2
N	490-550	854-957	R3-R4
At up to 1.5A an MC-E M-bin perfoms roughly equivalently to a single XP-G R5.
SSC P7 bins
C		700-800	Q4-Q5
D		800-900	R2-R3

SST-50 & SST-90 flux bins and luminous flux
bin SST-50 SST-90
1.75A 5A 3.15A 9A
100% 273% 100% 270%
G 350-425 956-1160
H 425-500 1160-1365
J 500-600 1365-1638
K
L 700-850 1890-2295
M 850-1000 2295-2700
N 1000-1200 2700-3240
specs @ 25°C; typical thermal sag with good heat sinking
would be ~8% for SST-50 and ~17% for SST-90

Cree XM-L Data for T6 min flux
I [A] 0.35 0.7 1.0 1.5 2.0 3.0
rel flux 52% 100% 138% 195% 245% 325%
flux [lm] 145 280 386 546 686 910
U [V] 2.78 2.9 2.98 3.09 3.19 3.34
P [W] 1.0 2.0 3.0 4.6 6.4 10.0
eff. [lm/W] 149 138 130 118 108 91
specs @ 25°C -- flux bins (flux @ 0.7A):
T5: 260-280lm - up to 7% less flux and efficacy
T6: 280-300lm - up to 7% more flux and efficacy

Cree XM-L Data for U2 min flux
I [A] 0.35 0.7 1.0 1.5 2.0 3.0
rel flux 52% 100% 138% 195% 245% 325%
flux [lm] 155 300 414 585 735 975
U [V] 2.78 2.9 2.98 3.09 3.19 3.34
P [W] 1.0 2.0 3.0 4.6 6.4 10.0
eff. [lm/W] 159 148 139 126 115 97
specs @ 25°C -- flux bins (flux @ 0.7A):
U2: 300-320lm - up to 7% more flux and efficacy
but I wouldn't count on that...

SST-50 & SST-90 flux bins and luminous flux
bin	SST-50	SST-90
1.75A	5A	3.15A	9A
100%	273%	100%	270%
G	350-425	956-1160
H	425-500	1160-1365
J	500-600	1365-1638
K
L			700-850	1890-2295
M			850-1000	2295-2700
N			1000-1200	2700-3240
specs @ 25°C; typical thermal sag with good heat sinking would be ~8% for SST-50 and ~17% for SST-90

Here are some charts of top-bin LEDs:

flux vs. current

The lines are quite near to each other in that plot, so the next plot shows flux per current.
For the 3*XM-L U2 the current is meant as the total current in a parallel setup (uncommon) or as three times the LED current (in a serial setup) for an easier comparison to the SST-90.

flux per current [lm/A] vs. current

XM-L T6 starts at 420 and goes down to 303.
The XP-G S2 starts at 430 and ends at 329 lm/A.
The MC-E M-bin is roughly as much below the P7-D as the MC-E N-bin is above it.

efficacy, flux per power [lm/W] vs. current

...and finally the efficacy, which is flux per power:

XM-L T6 starts at 159 and goes down to 91 lm/W.
The XP-G S2 starts at 161 and ends at 93 lm/W.
The MC-E M-bin is roughly at the same level as the P7-D.

Sources: Cree datasheets, Luminus datasheets
I extracted all info from the data sheets, some by reading values from graphs as well as I could.
Virtual die size is measured by myself though, with 3% estimated tolerance.
Note that CREE specifies a flux measurement tolerance of +/- 7%, so don't take the last digit seriously.