I just purchased some LED replacements for incandescent 'candle' lamps and found they perform really well. I'm puzzled at how these particular ones work though. They have E14 bases which is too small to house any significant electronics, specifically any sizeable electrolytic capacitor and the LED is shaped like a conventional filament. It looks like a thin strip, about 1 x 25mm and is coated in what looks like the same yellow paint used in normal white LEDs. It has a turn on time of about 0.5 second and turns off instantly so there must be some electronics in the base, presumably using a HF ballast. What makes it different to other lamps is there is no heat sink whatsoever and no reflector, the light seems to come from under the paint layer. It has almost perfect 360 degree light output. I'm not sure how the LED itself is fabricated, maybe lots of series junctions along the strip to spread the light better and build up the voltage needed to drive them. Can take a photograph if needed.
Brian.