LED bulb 50 Hz what why use driver?

[JohnW2]

They go blue when you over clock or power them

As I understand it, since no-one has (yet) managed to make an LED ('element') which produces white light directly, all white ones essentially produce blue light, which is converted to white by some sort of fluorescence.

Kind Regards, John

 

[bernardgreen]

The majority of LED elements produce ultra violet energy that excites the phosphor layer.

There have been LED "elements" that were three separate junctions each producing one of the three primary colours. Red Green Blue

The first of these were devices with 4 leads which allowed for the currents in each element to be individually controlled to get the ratio of Red Green Blue to be that of "white" light and also to vary the colour to a chosen colour.

A lot of investigation was then made into how to create a two lead "white" light device. The three elements would be sized and structured relative to each other so as to produce the correct ratio of RGB with the same current though the three diodes. It was possible to achieve "white" light but mass production was not possible ( at the time ) due to the extreme precison needed in the semi-conductor fabrication of the elements to achieve the required R G B ratio.

 

[Echo the husky]

If anyone has ever prized the yellow petals off a Philips Master LED lamp the LEDs certainly appear to be a deep ultraviolet blue, the light certainly turns your eyes inside out.