Accurate light meter starts at about $100, a good bang for the buck meter is Extexh EA30. I have one from my last hobby of flashlights & I use it to get measurements at each window for orchids.
I also had a cheaper $30 light meter before that, bought from deal extreme. That Was very inaccurate but consistent, it's about 20% lower reading consistently ok to use but need a good meter to figure out how much off & manually apply correction after each read.
I also tried several light meter free apps for iPhone, reading are all off a lot, 2000 ft cabdles reads 6000 to 10000 range, not able to use it.
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