Question re: testing new bulb

[bramstroker]

Question re: testing new bulb

[CM000n]

I think your observations are quite normal. In order to control the brightness of an LED in a controlled manner, the change in current must be oriented exactly to the non-linear current-voltage characteristic of the light-emitting diode. The LED is a diode and initially reacts only minimally or not at all when the supply voltage increases. Only when the forward voltage is reached does the current and thus the luminous efficacy rise steeply. A dimming similar to the light bulb would therefore have to result in a completely different correlation between the input variable (position of the control potentiometer) and the output variable (light output of the LED). In modern dimmable LED power supplies, the signal of a phase angle control is converted into a control current with the help of an evaluation circuit, the level of which determines the brightness of the LED. Depending on the driver circuit, which also has losses and an inherent consumption, dimming thus does not necessarily result in linear patterns.

I'm looking forward to your PR. Every bulb counts 😉

[bramstroker]

Thanks for your extensive answer @CM000n. Glad you have the knowledge, most of it sounds like abracadabra to me ;-), but sounds plausible. I don't know that much about the hardware side of dimmable led lights. My expertise is in building software.
Anyway @OzGav you are good to go regarding a pull request. Keep that bulbs coming..

[OzGav]

OK thanks. PR submitted. You will see I observed the power rising in a saw tooth fashion. It would drop slightly for a few percent of brightness increase then jump up and repeat that pattern.

[nepozs]

You will see I observed the power rising in a saw tooth fashion.

It is quite normal situation, but it is hard to explain, main reason is corelation between voltage step-down converter and PWM dimming used in LED bulbs. Models with saw tooth charcteristic have also variable power factor (so it is even harder to explain how it works).