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Although I cannot find any information on the footprint specifications of this bulb, I believe these are standard flood lamp reflectors which are usually rated with a 120 degree footprint.
I've used these in outside motion detectors. These should work on the same principle as your smart switch. I assume that your smart switch is NOT using a relay to turn the light on and off but is designed to use the low resistance of the bulb in some manner. I have seen this type of problem on 2 motion sensing porch lights. I put in an LED light and one would flicker and the other would not go on. I put in halogen or regular bulb and both work just fine. One is designed to slowly go on, so it doesn't use a simple relay. The other likely uses a zero crossing circuit to minimize jolt as the light goes on so also does not use a simple relay. But those are just guesses, although reasonable. I currently have 6 smart switches and pulled 1 apart since it came broken. All 5 work well and the one did have a little relay in it. I don't know of a reasonable fix except to get regular smart switches or live with higher electric bills.
Should be just fine. They will run cooler, of course. And there are 3 colors so you can get different effects. I think these are called bright white, white and warm or soft white.
I used both for motion detectors around barn and house. 120 lights up more of an area than 90, as you'd expect. In more of a confined area, the 90's probably feel the same, but I appreciated illuminating a larger area around the barn with the 120's. I don't think I really noticed the 90's around the house as being less light.
Most people don't read much on the package and grab a light because it looks like what they are looking for. I agree it would be clearer to include spotlight/floodlight for those not familiar with this new class of bulb. On the other hand, some lights are used to warm areas for barn animals, etc, and in that regard, these would be poor floodlights. I agree that flood or spot is weird. Floodlight/spotlight would assure me that it is what I'm looking for.
I can't tell you definitively, however these don't heat up like filament bulbs so probably present little problem to painting. The plastic body should take paint easily including sanding, if you need a super professional job.
I have not experienced this issue, mine (dimmer and bulbs) are silent; Do you mean the dimmer hums, or the bulbs make audible noise? I'm on a road trip and don't have access to my references...but I'd suggest you do a search (google, bing whatever you use) with the terms "LED compatible dimmers"... see what shows up.. Perhaps the manufacture will offer some addition information.
any dimmer works