Please help: lower leaf curling up with spots [pics]

I posted this in the Newbie forum by mistake so I will link that thread for pics.
One of my plants has one lower leaf curling up and has spots. The opposite leaf has spots. Would appreciate any feedback to fix this.

My setup. This happened in a home made pc grow box with 2 x 23 watts cfls of 6500k. Aluminum foil. I was testing this setup when it happened.

Pics and more details here www.rollitup.org/newbie-central/546314-lower-leaves-turning-up-spots.html
 
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