It's 11 years since I first looked at a very expensive Calex branded version of this bulb. At that time they were using a capacitive dropper and had all the LEDs in series.

I was expecting it to be the same, or maybe a linear regulator. But it's not. And the LED wiring arrangement is different too. Probably to make manufacturing simpler, allow a wider voltage range and also allow for the same LED structure to be adapted to different sized bulbs.

These bulbs are now available at a much lower cost online, and in a wide range of colours including warm, cold and golden white, blue, ice blue, green, yellow, red, pink and purple.


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