fordwillman,
I have had the same result. I live in Phoenix. I tried 3.5" glass magnifying glass. I can get wood to smoke a little but that is all. It is also very hard on your eyes. I have decided that even if it could start a fire I would not use it because it could damage my eyes. I want to keep what vision I have left.
_________________________
Thermo-regulate, hydrate and communicate.