Aqara T1M (ZHA): Slight stutter / micro-flicker during initial transition when color temperature is adapted on turn_on

[Mazoku01]

First of all, thank you very much for this addon.
I truly appreciate your work — Adaptive Lighting is an excellent and very important part of my Home Assistant setup, and I use it extensively.

Environment

• Home Assistant: latest stable
• Adaptive Lighting: latest stable
• Zigbee integration: ZHA
• Light: Aqara Ceiling Light T1M
• Comparison device: Aqara LED Bulb T2 (works correctly)

Description

I am experiencing inconsistent turn-on behavior with the Aqara T1M when it is controlled by Adaptive Lighting via ZHA.

The behavior depends strongly on whether "Intercept and adapt light.turn_on calls" is enabled.

1. Adaptive Lighting enabled + intercept ENABLED

• The light turns on immediately, without any smooth transition
• After turning on, Adaptive Lighting applies brightness and color temperature
• The device’s native smooth fade-in is completely bypassed

This results in an instant light-on, followed by delayed adjustments.

2. Adaptive Lighting enabled + intercept DISABLED

• The light turns on using its native transition
• However, the first ~0.5–1 second of the transition shows a slight stutter / micro-flicker
• After this initial phase, the transition continues normally

This behavior is much better than with intercept enabled, but still not fully smooth.

3. Adaptive Lighting disabled

• The light turns on fully smoothly
• Native fade-in behavior works perfectly and consistently

Key observation

The issue appears only when color temperature is involved during turn-on.

If color temperature is applied (either by Adaptive Lighting or by a custom automation),
the smooth transition is disrupted.

This behavior can be reproduced even without Adaptive Lighting:

• light.turn_on with brightness only → smooth
• light.turn_on with brightness + color_temp → immediate jump or stutter

Comparison with other Aqara lights

Other Aqara lights I use (e.g. Aqara LED Bulb T2):

• behave smoothly
• support intercept mode correctly
• do not show stutter or immediate turn-on

This suggests the behavior is specific to the Aqara T1M.

Expected behavior

A smooth fade-in on turn-on, including brightness and color temperature adaptation,
consistent with other Aqara lights and other manufacturers.

Notes / Hypothesis

This behavior appears to be related to how the Aqara T1M firmware and/or the ZHA implementation handles:

• combined ON + color temperature commands
• multiple Zigbee commands during initial power-on

When color temperature is applied immediately, the device seems to override or partially ignore its native transition, resulting in an instant turn-on or a short stutter at the beginning of the fade-in.

It is unclear whether this behavior is:

• purely a device/firmware limitation of the Aqara T1M,
• related to how ZHA sends initial commands,
• or something Adaptive Lighting could potentially mitigate (for example by delaying color temperature adaptation for specific devices).

Question / Request for help

I would like to ask the community and maintainers for guidance:

• Has anyone experienced similar behavior with the Aqara T1M or similar lights?
• Is there a recommended configuration or workaround to achieve a fully smooth turn-on including color temperature?
• Would device-specific handling (e.g. delayed color temperature adaptation) be technically feasible in Adaptive Lighting?
• Or is this something that should be addressed on the ZHA / device firmware side?

Any insights, suggestions, or testing ideas would be greatly appreciated.

Thank you again for your excellent work on Adaptive Lighting.
I am happy to provide logs, videos, or perform additional tests if that would help.

[dimatx]

I'm getting this light delivered early next week, and I can try it with Zigbee2MQTT and see if I can reproduce the issue. Seeing how it behaves with Z2M may help narrow down the source of the undesired behavior you are describing.