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iDante comments on My simple hack for increased alertness and improved cognitive functioning: very bright light - Less Wrong
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Comments (126)
What's the point of randomization if you can easily tell the difference between a bright bulb and a dim one?
Of course you can tell the difference. That just means that your self-experiment is not blinded (if you'll pardon the pun).
Randomization still eliminates some confounding factors even without blinding. For example, you might be more likely to decide to turn on your bright lights when you're already feeling alert.
Yep yep. It's just not quite as strong as a blind study, but that's fine for these purposes.