There are LED bulbs on the market that have great compatibility with all dimmers. I hope that market forces eventually weed out all of the less compatible LED bulbs. At that point, LED bulbs should be truly interchangeable with incandescents for lighting (heat generation, not so much).
I've got a few of the good ones for dimmers, I have however had a problem with them still. They're too efficient, all of the dimmers I have don't got low enough to be able to actually get them dark at the low end. They're all still fairly bright and I've already gone to bulbs rated at half of what I had originally. I think it's just something that's going to take a bit to actually catch up properly.
True, but it depends. I bought a bunch (16?) of top-end Soraa MR16 bulbs at about $30 apiece to replace the halogens in my new house. This is not something everyone can easily afford.
Of course, it turns out that even though they have great dimmer compatibility, they're not 100% compatible with my magnetic dimmers. I have to trim them to 80% of peak; if I try to run them over 80%, the transformer resets and the bulb turns off. Sometimes they strobe for a few seconds when they're running at max brightness, I haven't solved that issue yet.
So unless I want to replace every transformer at ~$60 a pop or more (plus labor costs if not doing it yourself), plus likely a bunch of switches.. It's either $100 per bulb to go LED, or suffer with not-quite-perfect replacements.
I think often the answer is "you won't know until you try it". Forward-phase, reverse-phase, symmetrical... Low voltage in particular makes things more complicated.
Why can't the LED controller circuits come with a calibration feature that detects (with user help) the minimum level the dimmer will support, and makes that the all-black point?
Partly because the usual minimum level the dimmer will support is off. That is the all black point :)
I know what you mean though. It'd be nice if there was some way to adjust them to change the brightness curve to match what you'd expect. It's one reason I'm considering something like the Phillips Hue bulbs instead of dimmers in the future despite the cost difference.
NOW there are LEDs on the market. I'm a bit of bulb person and have tried all sorts of LEDs. The other problem is that many of the LED bulbs used to look bad if they were not in a shade. Fortunately that situation has also improved.
