Well then, here is the text of the instructions
Here is an explanation of the four buttons:
1. +- is the dimming function
2. colour
3. timer 3/9/12 hrs
4. on/off button

Settings
Dimming function
- The +/- button (1) is used to set the dimming function.
Each time the key is pressed, the brightness level decreases and
increases again after the lowest brightness level.
- After switching off via the on/off button
the luminaire switches on again at the last brightness level set.
brightness level.
Light modes
- The arrow key (2) is used to set the light colour.
- First keystroke: Blue light
- Second keystroke: Red light
- Third keystroke: blue/red light
- After switching off via the on/off button
the light switches back on with the last colour that was set.
colour that was last set.
Automatic switch-off function (timer)
- The timer key (3) starts the switch-off function.
is started.
- First press of the button: automatic switch-off after
3 hours, the on/off key flashes continuously
1x - pause - 1x
- Second press of the key: automatic switch-off after
9 hours, the on/off button flashes continuously
2x - pause - 2x
- Third push-button action: automatic switch-off after
12 hours, the on/off button flashes continuously
3x - Pause - 3x
On/Off button
- The on/off key lights up constantly in standby,
it goes out after switching on.
6 Maintenance and care
- Clean this product only with a lint-free, slightly damp cloth,
damp cloth and do not use any aggressive
aggressive cleaners.
- Make sure that no water enters the product.
the product.
Hope could help. In any case, the lights have overwintered my two citrus trees in the dark garage super. Although my neighbour thought I had an illegal hemp plantation at first😂.
Greetings

By reading the instructions. But if you press the clock symbol 3 times, the lamp burns for 12 hours, then not for 12 hours, then again for 12 hours, etc... The lamp has three dimming levels;-)