Inline dimmer – lights on at maximum brightness before reaching dim level set

  • August 30, 2013 at 00:17 #8815

    The electrical work for my new kitchen has just been completed, including some inline dimmers for the new (dimmable) LED ceiling lights.

    I’ve paired them with a mood switch, and my plan was to have one of the moods tun the lights on very low for when the dogs ask to go out in the night. That would give just enough light to see the back door and not bump into things, and not be too much of a shock to our sleepy eyes.

    After setting the dim levels and trying them out though, it seems the lights first come on at full brightness and then dim down to the required level. This completely defeats my intention, as you get pretty much blinded by the maximum brightness for the first second or so and may as well not have bothered with the subsequent low setting! I’ve left the setting on the dimmers at the minimum as I don’t get any flicker, even at the lowest dim level – not sure if that’s relevant.

    I’m really hoping this isn’t how they’re supposed to work – it seems rather poor if so. Hoping someone can explain this bizarre behaviour!

    August 30, 2013 at 14:10 #8819

    I have noticed the same from the master mood switch when using the main on and off buttons.

    I’ll try the mood 1-3 buttons to see if you get the same result and also from the LWRF app where you can go straight to a dim level.

    Might be that you have to use a sequence or scene and trigger it from the switch instead of going directly to the dimmer.

    Also worth logging a support ticket on to see what they say.


    Lighting: LWRF LED strips, In-line dimmers, In-line relays and Plug-in modules,
    Inputs: Master mood switch, Magnetic door sensors, Handheld remote,
    Controller: Domoticz running on Raspberry Pi with RFXCom. Plus recently a stack of Z-Wave units!

    August 30, 2013 at 22:15 #8822

    Could it be that the dimmable lamps are doing something odd? I have a master mood switch and it has three moods set on it including one with table lamps set to 25%. Granted they are incandescent, but they always come on at 25%, never 100%.

    Chris Mills
    Founder and Editor - LightwaveRF Community

    August 31, 2013 at 22:45 #8830

    Thanks for the replies. I’m glad (I think) to hear that this is not normal behaviour. For info the bulbs are Megaman 6w dimmable ones. I think it is these –

    I have logged a ticket. I’ll update this thread with any response.

    September 1, 2013 at 04:53 #8831

    Have you adjusted the dimmer curve dial? I noticed on the instructions the you will experience this behaviour after adjustment.

    Wifi link, plug in adapter's, wall and mood switches. Heating controls sometime?? We'll see. Lol

    September 1, 2013 at 12:31 #8832

    Have you adjusted the dimmer curve dial? I noticed on the instructions the you will experience this behaviour after adjustment.

    No, I haven’t touched the dial. I assumed that because I get no flickering, I didn’t need to. I was contemplating adjusting it anyway just to see if it mad a difference though….

    September 2, 2013 at 13:12 #8838

    I’ve just had a reply.

    I am sorry to read that you are unhappy with the function of our inline dimmer. The illuminating to full brightness then dimming down to the preset, is the way the device was designed.

    It was designed to overcome as many LED incompatibility issues as possible. At this point in time LED manufacturers do not make LEDs to any agreed standard, this means that they solve the various technical issues in LED illumination slightly differently with different chips sets. These differences lead to incompatibilities with electronic dimmers. One of these incompatibilities shows itself in some LEDs that will not function unless they are turned on at full brightness.

    Hope this helps, please feel free to call me direct if you require further information.

    So, it looks like I’m stuck with it working like this. Nice to have a quick response and explanation though.

    September 2, 2013 at 14:50 #8844

    Might just be a coincidence, but I also had problems with Megaman products, albeit there was 8x 6w Megaman LED GU10’s on a normal LWRF dimmer switch, which would flicker pretty much all the time. Could be something in their chipsets that is incompatible with LWRF

    LightwaveRF for electrics, Harmony Home for gadgets, Heat Genius is next, and Now toying with IFTTT

    October 12, 2013 at 17:37 #9482

    Hi there. I have just bought one of these. I too have the same issue in that no matter what level of dimming I turn the light on to, the lights go to 100% and then dim down to the chosen level. I read above that this is part of the intended design, but it is quite a flaw. We are using this inline relay for bathroom lighting, the idea was that at night we could have the lights on a dimmed level if we wanted to go into the bathroom. The reality is, we take our kids to the bathroom and turn on to a preset of 25%. Instead we get 300 watts of bright light for 4 seconds and then they dim. It is like having a flood light shone in your face.

    Is there no way around this?

    If not, it is a shame as it defeats part of the purpose of having them. Maybe lightwaverf could consider adding a bypass switch to bypass this feature.

    Also, please lightwaverf fix the app / improve the app. It crashes a fair bit with ios7.


    January 3, 2014 at 21:26 #11450

    I am also having the same problem. I am using halogen bulbs not led bulbs.

    I am coming to the end of complete refurb of my house and initially i bought a couple of 3 gang wall dimmers for the bedrooms to try them out. These operate as expected and fade up to the preset dim level.

    I was so pleased with them that decided to cancel the system that I had originally planned for the ground floor, (professionally installed lucid lighting system), and bought 10 inline dimmers and 5 scene controllers. What a massive and expensive mistake I have made. The inline dimmers do not behave the same way as the wall dimmers. As others have said, they go to full brightness before coming down to the stored level. It’s ridiculous. The room lights up to blinding levels, ( lots of down lighters and some big chandeliers), before coming down to the more sensible levels that I have preset.

    I am so upset.

    September 14, 2014 at 23:34 #15420

    Sorry to resurrect my old thread, but I’m now about to redecorate a cinema room and I’d like to replace my current Futronix dimmer with something RF controlled. After watching a film (lights off) I need to be able to dim the lights up to a low level while our eyes adjust, so the above described (frankly illogical) inline dimmer functionality is no good. Can anyone suggest any way I can accomplish this with LightwaveRF? If not, what would be a reasonably priced alternative?



    September 14, 2014 at 23:58 #15421

    Try a fibaro dimmer. They great 😀

    developer of BMS Link ( A cloud based Home Automation platform for LightwaveRF, Z-Wave, RFXCOM.

    September 15, 2014 at 06:06 #15422

    skiv do you know a gu10 led that works well with fibaro?

    September 16, 2014 at 14:53 #15458

    Thanks for the info skiv. Sounds like I’d better do some Investigating of fibaro / z-wave.

    I’ve invested quite a bit of time & money already in LightwaveRF so I’d really like to stick with it, but I don’t see how I can when this fundamental part of their product line seems to have broken functionality. I’m actually amazed that this isn’t causing an issue for more people – the dimmer simply does not work in a reasonable way.

    September 28, 2014 at 18:08 #16094

    Just discovered something interesting. The inline dimmer can do a proper “dim up” start, but only when I turn the lights on by dragging the slider in the app!

    So, this isn’t a hardware limitation, nor is it something done (as the manufacturers suggest) because of some LED specific reason. It rather seems to be that the inline dimmer isn’t being sent the correct code from the remote/mood switch to allow this!


You must be logged in to reply to this topic.