# Interesting Zigbee ZLL behaviour **URL:** \ **Category:** Connected Things\ **Created:** [August 14, 2016, 11:58pm UTC](https://community.smartthings.com/t/interesting-zigbee-zll-behaviour/54924 "2016-08-14T23:58:08Z")\ **Posts on this page:** 1\ **Showing post:** 13
**Author:** ![JDRoberts](https://yyz2.discourse-cdn.com/smartthings/user_avatar/community.smartthings.com/jdroberts/32/56577_2.png) [@JDRoberts](https://community.smartthings.com/u/JDRoberts)\ **Post date:** [August 16, 2016, 3:33am UTC](https://community.smartthings.com/t/interesting-zigbee-zll-behaviour/54924/13 "2016-08-16T03:33:36Z")
> [@bridaus](#): > > Just observations, don’t want to start that discussion here but feel it might be relevant. How can a mesh network perform if some of its nodes are constantly going on and off? In theory it should heal, but in practice… If they’re not repeaters, nodes going on and off is no problem. That’s what mesh was designed for. If they’re repeaters, yes, it can be a problem. But smart bulbs can and should be left on power all the time. ( see manufacturer instructions.) There are many options to use for smart switches that will give you a tactile physical wall switch without cutting power to the bulb. > [@FAQ: Philips Hue and Other Smart Bulbs - What sort of light switches to use with them? (Long FAQ)](https://community.smartthings.com/t/faq-philips-hue-and-other-smart-bulbs-what-sort-of-light-switches-to-use-with-them/28984): > > Thinking on a big move to Hue lights, the real question is - what switches to use with them? If they’re all automatable via ST and other devices, do I really want to put them all on controllable switches too? There’s the advantage that I can arrange to ensure those switches are on so that the the Hue bulbs would be too…but it also leaves open the ability for folks to just turn them off and leave them off. Hmm. Thoughts? In the UK, Popp and devolo make a very nice battery operated wall switch to use with smart bulbs and community members have devised some mounts for them that will meet most peoples aesthetic requirements. In the US, there are two available “smart switch covers” that fit over the existing wall switch and solve the power issue. There are other options as well. The issue for this thread is something altogether different-- The fact that smart bulbs attached directly to the SmartThings hub do not appear to repeat correctly for other ZHA devices. That’s true even when they’re always left on power. 😥 --- _[View the full topic](https://community.smartthings.com/t/interesting-zigbee-zll-behaviour/54924)._