Question on strobe effect when at certain levels

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1

So I have a rule where the rear hallway lights are 100% during the day and 20% at night.

This rule has worked for months and months.

Suddenly, when running the night rule, the lights then started to strobe or flicker on and off.

So I set the night time dim level to 50% which mostly solved the problem.

However I really want the dim level to be 20%.

Thinking that bulbs were failing I bought 2 new high quality bulbs. Different brand.

Same exact behavior.

Replaced a zooz zen72 with a brand new one to see if this helps.

So far setting dim level to 20% works, but setting to 100% it flickers badly.

Setting it to 95% seems to fix it

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2

I would start with Zooz's troubleshooting steps for this exact problem:

https://www.support.getzooz.com/kb/article/657-lights-flicker-with-my-zen72-dimmer-switch/

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3

Thanks, other than making sure the bulb is listed as dimmable, how to know whether it will work without flicker?

4

As the support article suggests, consider wiring in a bypass. 2 (LED) bulbs may be too light of a load at lower levels.

5

Did you read the article?

Make sure they are compatible with TRIAC or leading-edge dimmers specifically, as mentioned there. The bypass idea above is also in the article.

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6

Looking at a bulb on Amazon I see it states dimmable, but I do not see whether it is triac or not.

What is weird is that it worked without flicker for a long time and then suddenly started really bad flickering

7

Sounds like a cheap bulb going bad to me.

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