I’ve got a couple of Livolo on/off switches working well. They did need a Livolo resister wired in to the ceiling rose to stop the three LED 3w lamps flickering when off but I’m pleased with it. Cheap from Ali express too!Running RFXCom with Domoticz on raspberry pi3. LWRF dimmer switches, PIRs and plug sockets. Some Homeeasy switches, harmony hub controlling AV and air con. Geofencing with Pilot app. Tado for heating and cooling.
As described the problem with no neutral devices is the trickle current that has to go through the bulb. This was not a problem with old school incandescents / halogens as the current wouldn’t make them begin to light up. As LEDs need little power then this trickle current can cause them to start to turn on flash etc. Dimmable bulbs are more tolerant of the trickle current but some are better than others hence the compatibility issue even with dimmables.
The battery idea potentially suffers a bit from the same problem as the charging current must go through the bulb but does give a bit more flexibility.
Part of the key to a more universal neutral-less design is having a very efficient well designed power supply in the switch / dimmer which reduces the trickle current as much as possible and keeps any current spikes small. This is complicated by the need for the power supply to work in both off and on modes.
Gen1 LW200 dimmers were poor in this respect. They use a simple and inefficient capacitor dropper power supply which generates a largish trickle current of a few mA and also had a largish voltage drop in the on mode restricting the maximum brightness. LW400 were a bit better in this respect. I don’t have any Gen2 devices to know whether it has been improved further.
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