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9 points

photoelectric detectors use infrared LEDs. and they are inside the detector, shielded so stray light will not cause any problems.

Any red LED you see on a smoke detector is for statuses, not detecting

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4 points

Thank you for the correction, you’re right. I got it mixed up with the status LED that some/most(?) smoke detectors have that will periodically blink to show that it’s active.

Regardless, a smoke alarm blinking red is to be expected, and doesn’t mean that it needs to be tested. Most of them will make a loud ping to notify the user that it requires attention, as you can’t expect people to notice the blinking LED alone.

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1 point

it would be nice if there were smoke detectors that didn’t have flashing lights during normal operation.

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2 points

Well, the problem with that is that a completely dead smoke detector does also not blink

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