Expodisc test shots

Well when i got my 40d i said im getting the expodisc to try it out. I've always had a problem with trying to get the right WB with street lamps (hid).

I used it the other day and was impressed by it and how much more accurate and more true color there is in the pics.
Well here are 2 pics i took yesterday or saturday with expodisc and daylight WB. There is a noticeable difference between the 2.

Daylight:

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You might try using a WhiBal card to get your WB to where you need it. You'd take the card and put it in the light source that you want to adjust the WB to, in your case being shined upon by the streetlight, and take a photo of the card. Then in post processing, you would just adjust your WB settings to the photo of the WhiBal card. It works great and is quick and easy.

http://www.pictureflow​.com/products/whibal/

They have a video instruction set you can watch to get a feel for the cards and how to properly set your WB in post processing.

Here's a pic of my card in "action".

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i had a grey card in my old bag, but i threw it out when i cleaned out both my old bags since it was bent a bit and i had just gotten the expodisc. i'll look into the one you recommend.