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That's incredible!

Amazing LCD's...!

Ioannis

I am interested in the supplier please.

Ioannis

We have not seen rain for months... Very dry here and many wildfires.

Indeed the b on w is very good. Hope it has same LED current needs as w on b. After all, both have white LEDs.

Maybe I can...

That is strange... Usually they have narrow angle on the vertical axis, not on horizontal.

White on blue is most interesting for the user, at least that is what I receive from customers.

Ioannis

The white LED on blue background are the most efficient. Green LED seems the most current hungry, 10 fold up.

Ioannis

As long as you have the same module you will be ok.

I think I use the same one from Ali express. About 3.5€

Ioannis

If you replace the 2222 with a MosFet, then the 100 ohm resistor is OK. But for an NPN bipolar, I think it is too low! A 1K to 4k7, depending on the Ic current and the Hfe of the transistor would be...

Well, 5 Amps? No way the ... baishundianzi will perfom a 99,9% conversion...! Get ready a fire extinguisher when testing 24->5 @5A.

Ioannis

Another idea would be to use a low drop linear regulator for 5 volt and use the cheap switch mode ones to lower the 24 volts down to 6-7 volts. That way power losses on the low drop would be minimal...

I would not trust those chinese modules for serious projects. Rather design your own based on the TI or Microchip App. Notes for you specific needs.

The modules are just bad copies of western...

Why not use SMPS? No heat generated, no heatsink needed.

Unless you need a clean +5V for ADC purposes. In all my cases though, a switching did not make any difference in the ADC.

Ioannis

Without knowing the specs of the LED's is not easy to say if it is OK to drive the LED string with 7V instead of with 5V as it was designed initially, even with PWM control.

Besides that PWM may...