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The bulbs put a fantastic range of colours - excellent Philips quality. The Philips Hue Bluetooth app discovered the bulbs and I was able to upgrade the firmware and change the colour/temperature settings very smoothly. However, those are the only two positive traits can I label towards these bulbs. Compared to the other cheaper smart bulbs that we have at home, the Philips ones can't be controlled remotely outside the home unless you invest in a £40 bridging accessory. Even if you have an Alexa devices with Zigbee built-in, you still won’t be able to control the bulbs remotely. That is pretty bad considering cheaper smart bulbs don't need any type of hub accessory. Additionally, you're limited to controlling 10 bulbs without the Bridge accessory - again, it's another good reason to stay clear of Philips as they try to lock you into an ecosystem that will probably not be supported in a couple of years’ time. And finally we come to the price - ouch. I can buy 6 smart bulbs with full colour functionality which can be controlled remotely without a hub. In conclusion, superb Philips quality with regard to the light output but everything else is a big negative. If Philips drop the Bridge requirement and drop their prices, I would consider buying their Hue lights but at this time, no.
I have four lights like this. Two of them (not the philips) I have got to work with alexa but these while I can control them from an app on my phone I can not voice control, despite many hours of mucking around with different devices / alexa / bluetooth / networks. So I have the choice of a light bulb with a switch which works and is cheap. Or this which requires that my phone support particular OS versions and allows network / bluetooth permissions before I can turn on a light bulb. Lets just take a reality check for a moment - this is a lightbulb which has software compatibility requirements and wants security permissions to my home network!
Now there is a point in lights like these. I have them because I have a partially sighted relative so allowing her to ask Alexa to select the radio station or turn on the lights makes perfect sense. For almost everyone else this is a just an expensive gimmick!