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Most (but not all) white LEDs have a specific property: the LED itself is creating pure blue light. To create the appeareance of white light, a part of the blue
by _ph_ 7y ago
Most (but not all) white LEDs have a specific property: the LED itself is creating pure blue light. To create the appeareance of white light, a part of the blue light is then converted to wavelengths in the green-red region via a phosphor coating. But, especially in cheaper configurations, it still leaves a pronounced blue emission line shaping the spectrum like this:
0
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With some coatings, the blue line completely vanishes, creating a light distribution close to an incandescent lamp, but others have a very pronounced line. In the light (sorry) of the report, it sounds reasonable to require a certain minimum "spectrum quality" for lightbulbs beyond a certain power output.
- seanalltogether 7y agoIs there a way to know which bulbs have this. Can you use CRI rating or something as a clue?
- _ph_ 7y agoThe CRI rating should be a good start. The lower the color temperature of the LED is, the less of a blue peak you should have. But the best would be to have a proper spectrum.
- mopsi 7y agoHow does this look like to you? https://i.imgur.com/rQaopcS.png https://i.imgur.com/rQaopcS.png Taken from Philips A60 leaflet.
- _ph_ 7y agoThis looks like a very good spectrum - pretty much like the best "warm" LEDs you can get. The blue peak is almost gone - or you can discuss whether it has a peak or a small weakness in the green-blue area.