http://wiki.answers.com/Q/How_many_l...tock_1156_bulb
I think this is a pretty interesting answer.
Also,
ddmtuning has a bulb w/ 60 3528 LEDs that puts out 420 lumens. I'm giving it a go for my rear turn signals.
I wasn't a huge fan of the ijdmtoy ones (i think only at 360 lumens like the modmy3 ones), so I might do a comparison when they arrive.