Trouble with making a ws1208b lamp

[1ABengineer]

I am trying to make a RGB led lamp for my sailboat.
It will be powered by twelve volts and has a rs485 transceiver to communicate to a m5dial.
To start out I made a prototype board, and used an off the shelf ws2812b matrix board for testing
my final design has 47 ws2812 LEDs, which needs way more power than the L7805 can deliver. so I decided to split the LEDs up in two power rails, one powering 24 LEDs and the other powering 27 LEDs.
When I tested it with 24 LEDs my lab power supply told me it was taking 420mA at 12 volt.
Which I found strange because a ws2812b led at full power uses 60mA and 24 * 0.06 = 1.44A.
Besides that, the L8705 became hotter than I like.
So for the final board i decided to use another linear voltage regulator for each power rail n.l. the LM1084 which can handle 3A
after building the final board it worked , the LEDs (at 50% as programmed) and the rs485 worked. But the LM1084's became really hot and my board stopt working within minutes. I led it cool down, and the voltage regulators still gave 5 volts and I could connect to the processor, but the LEDs did not seem to work anymore.
The LM1084's came from AliExpress, i don't have great confidence that they are not fake's
 
questions:


1.in my head if a circuit draws 420mA at 12 volts the L7805 can not deliver more than 420mA. in practice this assumption does not hold water, can it deliver more?
2.Is a linear voltage regulator that can handle 3A cooler than a voltage regulator that can handel 1.5A at a load of 1.44A?
3.Any tips on how to trouble shoot this? Before I buy the same regulators from mouser(20 euro shipping makes this expansive )
4.was it a bad idea to split the LEDs up in two power rails, it is the first time for me to have more than 1 power rail.

Any help Will be greatly appreciated
greetings Bert

[ledtester]

Use a switch mode power supply.

What power do you have on your boat? If you have AC power (like 110V / 220V) you can just use a 5V power adapter (also called a "wall-wart").

If you only have DC power then you can use a buck converter to convert 12/24V (or other voltages) to 5V.

Both solutions are much more efficient than linear regulators and will produce a lot less heat.

[1ABengineer]

thank you ledtester.
I will research buck and switchmode power supply.I have a 12-volt DC systeem, 220, maybe in the future