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Dangers of using leading edge


JonasHermansen

Question

Hi

 

I've got a Dimmer 2 with bypass and I have problems with the LED bulbs not dimming low enough.

 

I've tried several bulbs, including some Philips that the distributor has tested himself and reported should work.

 

When doing the calibration is selects a trailing edge dimming, which is in accordance with the bulb manufacturers instructions, but still the lowest setting is quite bright.

 

I then tried to use parameter 30 to force the dimmer to use leading edge - and that makes a big difference! The LED bulbs can now be dimmed much lower.

 

But why is this the case?
And what are the dangers of using the leading edge mode?

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  • To illustrate the problem of inadequate dimming I've made some tests this evening - Please see the album 

    Please login or register to see this link.

     

    The dimming performance is much better when using leading edge, but I'm concerned that it might reduce the life expectancy of the bulb or dimmer.

    And I believe I heard some humming sounds from some of the bulbs in leading edge mode.

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    I had same experience with trailing edge. for me the trick was to set max brightness (parameter 2) to 30% and after that dimming light does really lower light.... Doesn't make any sense to lower max brightness if you want to dim more but hey... It works for me :-)

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  • 13 hours ago, Reintjan said:

    I had same experience with trailing edge. for me the trick was to set max brightness (parameter 2) to 30% and after that dimming light does really lower light.... Doesn't make any sense to lower max brightness if you want to dim more but hey... It works for me :-)

    Thanks for the idea - unfortunately it didn't work for me.

    In my installation setting max brightness to 30% performed as expected and only reduced the max brightness :(

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