wrote in message
...
On Friday, June 30, 2017 at 2:00:04 PM UTC-4, Ian Field wrote:

Some LED bulbs are switch mode, usually flyback AFAICT. They are pretty
much
the same as CFLs on a triac dimmer.

http://creebulb.com/bulbfinder

We use Cree lamps where we need dimming, and in general if replacements.
We still have some few legacy LED lamps in place (stuff that came-with
other stuff), but we do not intend to dim those.

NOTE: some cheap LED lamps are very noisy in the RF range. VERY noisy,
approaching that of an unshielded ignition transformer (oil burner).

Most of the cheap LED bulbs I've cracked open were wattless dropper - they
absorb a small amount of mains borne crap.