Because the names refer to different parts of the light bulb, they don't cancel each other out. However, there are other-shaped bulbs that also use the E26 bulb base.

Confused between A19 and E26 light bulbs? Learn what these numbers mean, how are they different and similar, and how to pick the right one for your fixture.

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If there is no light modulation due to no repeating interrupting object, it seems to me both op amps become DC voltage followers. What if the ambient photo current from Q1 just happens to bias A1a in ...