A:Answer Those fixture work by applying current to different electrical contacts on a 3-way lightbulb, corresponding to different filaments that each prodcue a different brightness. Most LED bulbs won't have these separate contacts, and so what you'll see is that the bulb either just turns on full strength at every setting, or "skips" some of the settings, but you shouldn't ever notice any "halfway working" settings or anything like that.
Some LED bulbs actually do have 3-setting brightness capabilities as well, and will work the same way as an incandescent bulb in those fixtures, but I don't believe that the Philips Hue bulbs are set up this way - meaning, the Hue bulbs will work totally fine in that fixture, they just respond to the "brightness" settings. For any given setting the bulb will either be *on* or *off*. I think for most people this is the preferable outcome anyhow, since the bulb has its own brightness control that you manipulate via your Phlips Hue control system, whether that's via a Philips Hue switch, or via the app, or via IFTTT, etc.
