Lights brightness goes low and than back without HA even seeing it

[RensRutten]

Describe the bug and how to reproduce it:
The adaptive light works, it changes to the right colours and brightness. I am using Tadfri lights with Zigbee. But after like 1-2 minutes, the brightness of the light goes down, like I assume 10% maybe, and then slightly it goes back to the appropriate brightness. In HA and Zigbee the brightness isn't changed, so i can't see to which brightness it goes. Nothing shows that the brightness changes, only the light does.
In my HA I am not sending any brightness if the light starts or something, I have tried many configurations for Adaptive light. Even uninstalled and installed again, but nothing seems to work, and I can't seem to figure out what is triggering it.

It did this on all Bulbs and spots, so it was not just 1 place..

All help is appreciated.

Steps to reproduce the behavior:
If the light is turned on, and I wait it goes low after some time, so i can check that every time, i can't pinpoint and exact time.

(If using Zigbee2MQTT), provide your configuration files (remove all personal information before posting):
Iam using Zigbee, So i have unistalled Adaptive light and now only have it on 1 light, but it did it on all lights, i will post down here the configuration of the 1 bulb iam trying to fix now, if i get that working i think it would work on others. It also chagned t
"devices": {

        "0x2c1165fffe1120d7": {
            "friendly_name": "Bulb Toilet"
        },

"groups": {
"
"5": {
"devices": [
"0x2c1165fffe1120d7/1"
],
"friendly_name": "Group_Toilet_light"
},
"mqtt": {
"base_topic": "zigbee2mqtt",
"force_disable_retain": false,
"include_device_information": false,
},
"ota": {
"disable_automatic_update_check": false,
"update_check_interval": 1440
},
"passlist": [],
"permit_join": false,
"serial": {
"adapter": "ezsp",
"disable_led": false,
}
Conf of the light
{
"brightness": 188,
"color": {
"x": 0.5056,
"y": 0.4152
},
"color_mode": "color_temp",
"color_options": {
"execute_if_off": true
},
"color_temp": 454,
"color_temp_startup": 65535,
"linkquality": 196,
"power_on_behavior": "off",
"state": "OFF",
"update": {
"installed_version": 268572245,
"latest_version": 268572245,
"state": "idle"
},
"update_available": null
}

It's the TRADFRI bulb E27 CWS 806lm

If I am missing something, please let me know.

[adimit]

Got the same behaviour here with Trådfri using a deCONZ & ZSH. I've got no solution, though. My hue lights don't exhibit the problem, so I guess it's just time to ditch Trådfri? Separate turn on commands does nothing to correct the issue, even with a 1s delay.

[adimit]

This helped me now :)

You need to set transition to 0 (default value is 45).

[RensRutten]

Hi aleksandar, That is actually what I wanted to tell you. After testing for days and days I found out that transition on 0 works, than it stops. It is a weird thing they are doing, but this is an okay workaround. Thanks for the message!

…

________________________________ Van: Aleksandar Dimitrov ***@***.***> Verzonden: Thursday, October 30, 2025 9:02:19 PM Aan: basnijholt/adaptive-lighting ***@***.***> CC: RensRutten ***@***.***>; Author ***@***.***> Onderwerp: Re: [basnijholt/adaptive-lighting] Lights brightness goes low and than back without HA even seeing it (Discussion #1032) This<#207 (comment)> helped me now :) You need to set transition to 0 (default value is 45). — Reply to this email directly, view it on GitHub<#1032 (reply in thread)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AQ36GUNQ4FKC7GKCIS6EM2L32JVEXAVCNFSM6AAAAACKWQS7VKVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTIOBTGA4DGNY>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[djurny]

This sounds like the same behaviour i have with my Ikea Tradfri LED1925G6 bulbs. Indeed, as mentioned, set the transition to 0, somehow the bulb wants to transition from some level to the new level, but not starting from the level it is at currently. Odd to see this happen, almost literally the same as o.g. gaslighting.
Groetjes,