Move to a lighter room?

I have followed every instruction with this app and it still says it cannot get a reading, my camera is clean, I do not move my finger, my room has all the lights on and the app keeps saying it cannot get a reading. I decided to use a high powered LED torch behind my finger so lighter and the app once again says move to a lighter room. My Mac is a New 2013 MacBook Pro only brought a week ago so I know it is not the Mac.

I give this app 1 ★, 20 minutes trying to get it to work and nothing.

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☆☆☆☆☆ Update Review ☆☆☆☆☆
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It has taken close to a month to get this app on my MacBook to work, I changed the lights in my room from 6x60w normal globes to 6x60w LED globes and now the app works every time without a problem.

I now give this app 3 ★★★

MurasakiSamurai about Cardiograph, v1.1