I am looking for zigbee light sensors

Not that I'm aware of...

Where/when did you get them? The Mijia Light Sensors (GZCGQ01LM) have been out-of-stock for a while now -- and any new ones now being sold (Aqara branded?) might be a different hardware version that might not (yet) work.

Just received. Company called Techinn.
Model GZCGQ01LM
SKU YTC4043GL
SN: (for one of them) 23955/00027267
Production Date: 09.2020

I've tried drivers from oh-lalabs, birdslikewires and waytotheweb. Birdslikewires is the only one that shows an illuminance variable in the Current States, but that value stays zero and doesn't seem to update.
The other two drivers don't show illuminance at all.

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Mine says below in the Data section on model number...I'm away and can't check the actual model number on the sensor.

  • model: lumi.sen_ill.mgl01

Identical

Possibly you have a bad unit, then. Seems like it should work if same driver and same device.

The drivers are slightly different - there is a "b" at the end of @hokfujow's. Not sure if that really makes a difference though,

Ah, missed that "b."

Just opened up the third of 4 units. That one worked with the waytotheweb driver. Wondering if the other two are bad. Will try number 4

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Have gotten 3 out of 4 to work with the Chirpy/WaytotheWeb/Michaelson driver. I removed devices, reset them, and repeated pairing. They are initially recognized as what they are and the Oh-lalabs driver is selected. I immediately change the driver with no configuration, then do a config, save and double-click. That worked for 3 of them.
Still trying on the 4th.
Note that I tried this driver earlier AFTER having done initialize or config with different drivers - wondering if that process caused something to lock up in the hardware that required a full reset.

Correction: I earlier posted that the driver I got to work on 3 devices was Birdslikewires. That was a mistake; I've edited the post to correct that.

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