Ballast Discriminator BD1: Why am I seeing two different reading on it when press it twice and hold?

It just a faulty reading, you should be only pressing it once and hold it to see what kind of light come up. BD1 is trying to get the frequency to identify what kind of ballast you have in the fixture and when you press it twice and holding it, you are distracting the frequency which can led to faulty reading.

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