So then the speed must be a Hue Bridge thing. Mine is noticeably slow. I'll never find out how fast my Hue motion sensor could be though, because it refuses to work with anything other than the Hue Bridge.
That is very strange. Not to change this post but I thought I would ask if you had the same results using the Hue Motion Sensor driver?
I get no response regardless of the driver. It will pair, but I get no output. Are you in the UK or Europe?
Mine did take a few minutes before the child devices came in after I changed the driver. I think the light level was the last to come in.
I am in the USA
Another thing I remember is that before I scanned for devices in HE I held the button in until it turned green and release and then it should blink orange and then I started the scan.
Messed with it for hours each of the three times I tried. Pain to then fix my setup in the Hue bridge when I put it back. I'm done trying personally. Appreciate the tips though. Maybe they'll help someone else get it working.
At roughly $36 US per sensor for the Hue motion sensors, I think the Sylvania Lightly are a much better value at just $25 US each right now, and guaranteed to work with HE. Very fast too. Close second to the Xiaomi in terms of speed. No ambient light measurement in the Sylvania though, but they do measure temperature if you want that.
[Edit] I neglected to mention the new Smart Things motion sensors are just $25 regular price right now too. Don't have one, but they look nice 
@SmartHomePrimer Im curious about your Xiaomi Aqara motion sensor. Would you mind answering some questions?
- Is that paired direct to HE? Or do you need their hub as a go between?
- Do you have it in connected direct to homekit or would it be via HomeBridge?
- Is the ZigBee mesh not good enough to not need a repeater? What repeater do you have
- How long do the batteries last for you generally?
- Are you using the drivers from [Release] Xiaomi / Aqara device drivers
- Does the light sensor need movement to track changes in light levels?
Is this the sensor that you have - 100% Xiaomi Aqara Human Body Sensor ZigBee Movement Motion Security Wireless Connection Light Intensity Gateway 2 Mi home APP s-in Smart Remote Control from Consumer Electronics on Aliexpress.com | Alibaba Group
Sorry for the barrage of questions - Im always curious about new kit
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Sure, no problem.
Directly connected, but I do use two of the IKEA Trådfri outlets as repeaters
I run Homebridge, so the sensor status is available in HomeKit. You could use it in HomeKit Automations as well if you wanted, but I only use HomeKit for presence detection, device status, and a very occasional device operation. Outside of location, HomeKit automations have not reliable for me. YMMV
They seem to work fine if they're less than 20 feet from the hub, and would very seldom drop off, but have now been 100% stable with the addition of my two IKEA Trådfri outlets to repeat their signal. If they drop now, it's because something major has gone wrong with code I'm messing about with, and it's messed up other things as well.
I'm still on the original batteries. The first one I bought, arrived mid June, 2018. All the batteries still read 100% in the driver. Not sure if it's accurate or not, but they're all still working great.
Yes
Not that I have noticed. I don't use the illuminance measurement. It seems to be a bit coarse. All of them are in high traffic areas, so it's not something I've paid attention to closely. @veeceeoh can certainly answer that question though.
Yes, that's the one. Two I ordered came with the mount (which I'm not using anyway) and one did not.
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If it helps James, I find these sensors much quicker than my Hue, not to mention so much cheaper too 
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Another great option for UK residents. There's also a version 2 available. I'm not certain about that one. Might be a different manufacturer since Centralite has filed Chapter 7 bankruptcy, so they're going under. I have their version 1 and it's for sure Centralite. Very fast and sensative. Does not have light sensing, but measures temp.
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@Royski and @SmartHomePrimer thank you for your answers and info - seems like these Xaimo sensors are something to definetly have a look into as long as @veeceeoh can confirm motion isnt required for the sensors to update lux levels (for my setup, I have the hue sensors recording lux levels to a global variable when the lights arent on so need something that records light level changes especially when there is no motion - that way if someone goes into a room and the lux level is say 5, the light coming on doesnt mean lux goes over the rule value of light on when lux is less than 10 and therefore switch the light on for the 1 minute time out and back off because overall the room is now at lux 60 and therefore conditions are false).
A sensor that is faster than Hue sensors would be great 
Looking at my events, it certainly doesn't seem periodic like my Hue.
It does appear like its motion connected, when reported.
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Yeah and the Xiaomi are half the cost of the Lightify. But you can't be in a rush. Takes between 2 weeks, to a month to get them from China.
You have to pay a lot for smart home stuff in the UK. I'm not charged tax or duty when I've ordered from Gearbest, so even with shipping, you're paying 6 quid more than I am for the same sensor.
Unfortunately, the Brexit blunder is going to make things much worse for you I'm afraid (all of us actually). Here's hoping she swallows that false sense of pride and manages to rejoin the EU before it's too late.
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Motion IS required for the lux level to be updated and then reported to the hub.
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@bobbles and @Royski thanks for confirming. That is a shame. I guess that also helps the battery last so long.
I’m wondering if the window the rule running to update lux on motion in the global variable and the rule to evaluate the global variable and other conditions is big enough to use the correct updated lux variable before lights come on if real room brightness is low enough to start with 
Lol that’s tight. But worth a try! I will order one and see how it goes. Thanks for your help
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I'm sure you'll find a use for it, if not quick enough
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I'm not sure if this helps you or not but here goes.
I have Hue and Fibaro Motion Sensors in a bedroom pointed towards the window. It's not used often.
I then use cobras average all app to write the lux level to a virtual lux sensor.
I use the virtual lux sensor for the lux value in my lighting rules.
I have a virtual switch that turns on at Sunset and Off At Sunrise.
This switch then disables the average Lux app when turned on.
This means that if the bedroom light comes on between Sunset and Sunrise it will not affect the virtual lux sensor.
Not sure if this is something you can use but I'm more than happy to post if you wish.
@bobbles thank you. I tried that about a month ago from your threads on another page and you helped out greatly with questions. Since then I’ve migrated that lux recording to a global variable and simplified the process instead of the Average All device. And by recording each room individually into their own variable I can account for scenarios such as the curtains being shut in a bedroom and not wanting those lights to come on because I have individual room control 
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