Full led drop ceiling project thoughts

Hi!

Got some what I believe are great ideas.
Livingroom / diningroom / kitchen all in one big room, 5.5M X 10M

Will install a Rockfon Drop ceiling; with drop in plates.
Have Aluminium led strips which i fit magnet tape on.
Led strips fit nicely sunken between ceiling plates.

9 Long strips of 9 Meter
WS2811 24V Cob strip
Should total 1700Watt of 24V Led.
Will power with 2 40A power supply’s.
Might limit at 80% or 90%

Expect to have some fun with effects
Expect to be able to create “spotlights” where ever and how many i need.
For example only the leds above dining table should run during diner.

Voltage injection at start and end of 9M would be enough.
No drilling in any of the ceiling, totally removable due to the magnets.

thoughts?

Edit: Ceiling is black, so is profile.
Choose for Black PCB so only white COB line is visible, but it’s one straight line.
Still on the fence about a cover, prefer not for heat and clearity

Lots of energy for a indoor
You may get this with only 2 USB charger and simply WS2812B 2USD 1m 30 LED/ m stripe
on a D1 Mini
unique per room no wireing just plug

Please read the OP spec’s before making comments.
What they are describing is completely doable.

If that’s their requirements, so be it.

To answer the original question - I would question whether 2 injection points will be sufficient.
For 1700W (max) @24V you need ~72A, so your 2 power supplies should be sufficient.
Each 9m strip will need 8A total, or each “1/2” (powered from ends) of 4.5m needs 4A.

I’m skeptical the strip itself will carry 4A without a significant drop, that’s something I would test ahead of time. Your power wiring will need to be reasonably hefty, depending on the distance to the supplies.

You didn’t give any idea what the physical layout of the strips will be.
As well, the total expected LED count will be important.
Those factors may have some significant effect on how you deal with the data wiring as well as how many GPIOs you may need for the effects you’re anticipating.

I used this power calculator to conclude i would need no mid-injection. up to 997cm would be fine with 2 injections.

Ceiling will look like this:
Rockfon drop ceiling

The profiles I found to perfect fit between the panels and still be sunken:
https://webshop.tronixlighting.com/producten/led-strip-profielen-en-access-galaxy/inbouw/pl8-led-profile-200cm-black-ral9005-led-strips-max-12mm

So my first strip will be parallel to the wall (the 10m side) and than every 60cm is one strip of 9 meter, about 9 total of them, with a distance between strips of 60cm.

The WS2811 COB has “20 segments per meter”
So every strip will have 180 segments.

Whole ceiling would be 1620 segments.

Using that calculator for 9 meters of 24v 720LED/m (6,480LED’s) with a 60cm distance from psu to first LED it tells me:

  • LED power consumption: 635.90 W / 26.50 A
  • Recommended minimal wire crosssection: 3.31 mm2 (AWG 12)
  • Recommended fuse (automotive standard or mini): 30 A (fuse color: green)
  • Total voltage drop (wire + fuse): 0.282 V
  • Recommended number of injections: 4 (at the beginning, at the end of the LED strip and inbetween distributed)
  • Power off (standby) consumption: 14.990 W

Did you use WS2811 24Volt?
1 meter should equal 100 led and 21Watt
9 meter would be 189 watt, i believe you somewhat overshoot.

You said you are using the COB LEDs and they have 720 LEDs per meter. For power you calculate off total # of LEDs not LED segments :wink:

But isn’t the wattage off from the factory specs in your calculation?
should be 21 watt/m, and that is the brightest i have ever seen.

your calculated strip is 70watt/meter, impossible

Ahh I see the problem. Sorry. The way they list those COB strips is stupid. They are listing them 720 as each color… So yea it would be 240/m :tired_face: sorry

No problem, glad we come to the same conclusion.
And I can stick to my plan to feed from start and end.
So no drilling in the ceiling, only magnets.

I would make sure you have a level shifter. A lot of people have had issues with the COB strips without one.