White LED V/C/L

This post is in refrence to generic 'white' LED's with a nominal 3.1 voltage drop.

Can anyone provide a link to good set of graphs that show the general relationship between the voltage, current, and luminescence of these types of LED's? I'm trying to calculate optimal current/number of devices for a given voltage and determine it's likley lumen output range. This will be a diffused light source with reflectors in the apprpriate places so I'm trying to avoid the candella unit and want to look at straight lumens.

Edit:

Took my own advice and googled it after posting.
https://www.candlepowerforums.com/vb/showthread.php?t=89607

http://superbrightleds.com/specs/WW7035_specs.htm
These is a web that sells LED's, the link is directed to the datasheet of a white LED with Foreward Voltage of 3.2V.

I like the spectral graph in that PDF, it shows that these are really 'blue' LED's with a phosphor, you can clearly see the spike at 450nm and the wideband glow from the phosphor.