Look at the link on my original post up top ^

I ordered a set for my cell phone, but they are only 2" square which won't work for a 72mm lens.

If your using a dslr camera you might be able to manually set a white balance. Depending on camera of course. You would need a piece of white plastic to put in the tank under the light. Then focus on it and make sure your exposure is correct. You want it to be white and not grey. Then set your white balance off of that pic.

Cheers,
Tim

The following are available by the same seller and are larger (3" x 3") for use with DSLRs:

http://www.ebay.ca/itm/262210021686