On Mon, 15 May 2023 16:43:03 +0100, Cezar wrote:
> On 15/05/2023 15:52, J.F wrote:
>> On Mon, 15 May 2023 08:56:39 +0100, Cezar wrote:
>>> On 15/05/2023 08:45, Robert Wańkowski wrote:
>>>> Są białe diody LED, ale bez luminoforu?
>>> RGB?
>>
>> A tak swoją drogą - czy z faktu, ze RGB nie są stosowane, nalezy
>> wnioskować, że luminofor ma większą sprawnosć?
>> Tzn sa stosowane, ale tam, gdzie sie od razu daje zmianę kolorów.
>>
>
> ChatGPT:
>
> White LEDs are typically made using a blue LED with a phosphor emitter
> instead of RGB LEDs due to several reasons:
>
>
> Efficiency: Blue LEDs have higher efficiency compared to green and red
> LEDs. They can convert electrical energy into light energy more
> effectively, resulting in higher luminous efficiency. By using a blue
> LED as the primary light source, white LEDs can achieve greater overall
> efficiency.

Jak widac to podejrzewam, ale niebieski foton wymaga wyzszej energii i
wyzszego napiecia i zamienia sie potem na foton o nizszej energii ...
brzmi jak strata.

> Cost: Manufacturing processes for blue LEDs have advanced significantly,
> making them more cost-effective to produce compared to RGB LEDs. Blue
> LEDs are widely used in various applications, resulting in economies of
> scale and lower production costs.

Wow.
Ale inne kolory tez były masowo używane.

> Color quality: Blue LEDs combined with a phosphor coating can provide a
> high-quality white light. The phosphor converts part of the blue light
> emitted by the LED into yellow light, resulting in a combination of blue
> and yellow light that appears white to the human eye. This method can
> produce a more uniform and pleasing white light compared to the additive
> color mixing of RGB LEDs.

Hm ... a wydawałoby sie, ze diody Led połączone szeregowo powinny
dawac podobne ilosci swiatla ...

> Stability and longevity: Blue LEDs have proven to be more stable and
> longer-lasting than green and red LEDs. The blue light is less prone to
> degradation over time, allowing white LEDs to maintain their color
> temperature and brightness more effectively.

Hm. Diody RYG malej mocy swiecą dekadami.
W białych pojawiło sie "lumen maintenance".

> While RGB LEDs can be used to create white light by combining red,
> green, and blue light, they often have lower efficiency, higher cost,

RGB zamiast jednej B, to moze i wiekszy koszt, ale jak w "żarówce"
jest diod i tak 10 ...

> and poorer color quality compared to blue LED-based white LEDs.

Taa, szczegolnie jak sie pisze, ze luminofor daje żółty kolor.
Współczesnie daje juz mieszankę ...

J.