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Pulsing LED Strip on dimmer?

whjohnson
Fitted some IP rated LED strip in a bathroom controlled by a dimmer. When turned right down to low level, the led strip pulses dim/bright.

Strip is Aurora/Eternal, approx 3 metres in total and is supplied via a Aurora EN-LEDD7512 Triac LED driver rated at 75W max. This is controlled by a Varilight GPJJ100W dimmer switch which is supposedly programmable. Tried the methods described in the dimmer switich installation instructions but no joy.

Any ideas?
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    Well some combinations of LED driver (really small switch mode supplies that rectify the mains and then chop it to an AC at an supersonic frequency through a really small transformer core) and some dimmers, that are really just circuits to  chop bits out of the 50Hz mains waveform result in sad effects where the chopping waveforms of the switching supply and the dimmer drift in and out of step giving flicker at a visible rate. There is not a lot to be done  other than change one or the other

    This supply is supposed to be dimmable by a triac- the old fashioned sort of lamp dimmer. 
    I cannot find the GPJJ100W  you mention anywhere - do you have a datasheet ? - if it can emulate a leading edge dimmer, like a triac, that is your best bet, but it may not - then the next course is to ask the LED driver makers which dimmers they expect it to work with.


    Edit link to the dimmer    Now I think  you should try mode 2.


    CHANGING THE DRIVING MODE You may be able to improve the performance of your lamps by changing the driving mode to MODE 3, or with some types of lamp MODE 2. NB. It has been noted that some LEDs do not show the programming as well as others. If you are having difficulty seeing the programming steps, you can replace one LED lamp with a halogen one for the duration of the programming in order to see the steps more clearly.
    1. Switch on and set the dimmer knob to the MAXIMUM position (turn fully clockwise).
    2. Turn the lights off and back on again. OFF – ON, roughly once per second.
    3. Repeat step 2 at least twice more. OFF – ON – OFF – ON, roughly once per second.
    4. The lights will step up and down in brightness to show that the dimmer is in CONFIGURATION MODE, then either stay at a low light level or go off.
    5. To select MODE 3, first turn the knob fully anti-clockwise then fully clockwise. For MODE 2, just turn the knob fully anti-clockwise and leave it for a couple of seconds.
    6. The lights will FLASH 3 TIMES or TWICE to show which mode the dimmer is in. The dimmer can be operated normally in the new mode.

    [To check which mode the dimmer is operating in omit step 5}

    Trailing-edge mode (MODE 1) by default.
    The alternative trailing-edge mode (MODE 3) may improve the performance of some dimmable LEDs.
    Mode 2. This is a simulated leading edge mode (not TRIAC)
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  • 0
    Well some combinations of LED driver (really small switch mode supplies that rectify the mains and then chop it to an AC at an supersonic frequency through a really small transformer core) and some dimmers, that are really just circuits to  chop bits out of the 50Hz mains waveform result in sad effects where the chopping waveforms of the switching supply and the dimmer drift in and out of step giving flicker at a visible rate. There is not a lot to be done  other than change one or the other

    This supply is supposed to be dimmable by a triac- the old fashioned sort of lamp dimmer. 
    I cannot find the GPJJ100W  you mention anywhere - do you have a datasheet ? - if it can emulate a leading edge dimmer, like a triac, that is your best bet, but it may not - then the next course is to ask the LED driver makers which dimmers they expect it to work with.


    Edit link to the dimmer    Now I think  you should try mode 2.


    CHANGING THE DRIVING MODE You may be able to improve the performance of your lamps by changing the driving mode to MODE 3, or with some types of lamp MODE 2. NB. It has been noted that some LEDs do not show the programming as well as others. If you are having difficulty seeing the programming steps, you can replace one LED lamp with a halogen one for the duration of the programming in order to see the steps more clearly.
    1. Switch on and set the dimmer knob to the MAXIMUM position (turn fully clockwise).
    2. Turn the lights off and back on again. OFF – ON, roughly once per second.
    3. Repeat step 2 at least twice more. OFF – ON – OFF – ON, roughly once per second.
    4. The lights will step up and down in brightness to show that the dimmer is in CONFIGURATION MODE, then either stay at a low light level or go off.
    5. To select MODE 3, first turn the knob fully anti-clockwise then fully clockwise. For MODE 2, just turn the knob fully anti-clockwise and leave it for a couple of seconds.
    6. The lights will FLASH 3 TIMES or TWICE to show which mode the dimmer is in. The dimmer can be operated normally in the new mode.

    [To check which mode the dimmer is operating in omit step 5}

    Trailing-edge mode (MODE 1) by default.
    The alternative trailing-edge mode (MODE 3) may improve the performance of some dimmable LEDs.
    Mode 2. This is a simulated leading edge mode (not TRIAC)
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