Shabbat: Causing LED To Light Up

You may not do anything on Shabbat that will cause an LED to light up.
Note You may not turn on anything that generates noticeable light AND heat on Shabbat (and Jewish festivals).
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I just read this halacha, Shabbat: Causing LED To Light Up, at www.practicalhalacha.com. I think you will find it very interesting.