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--- xnorit:public:summary:ledlightsceiling [2024/10/12 16:48] – [Used materials] timdv91
+++ xnorit:public:summary:ledlightsceiling [2024/10/13 15:09] (current) – [PCB design] timdv91
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 ===== Preparation =====
 ==== Cabling ====
-A cat6 communication cable cable was installed across the ceiling, prior of finalizing the room. As has been makred, in the left image below. In the right image, the cable can be seen.
+A cat6 communication cable was installed across the ceiling, prior of finalizing the room. As has been marked, in the left image below. In the right image, the cable can be seen.
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 </WRAP>
-In addition I designed a smaller white LED circuitboard, with an FPC connection. Each LED driver can connect up to 8 of these, but only 4 in series due to current limitations of the FPC cables. This isn't any problem, as the LED driver PCB is positioned in the middle, giving us acces for 2 x 4 white LED PCB's on each side. Totaling 32 white PCB's, with 6 LED's each.
+I additionally designed a smaller white LED circuitboard, with two FPC connections. Each LED driver can connect up to 8 of these, but only 4 in series due to current limitations of the FPC cables. This doesn't form any problem, as our LED driver PCB is positioned in the middle. This gives us access to connect 2x4x4 LED PCB's, or 32 LED PCB's in total. Each white PCB contains 6 cold white and 6 warm white LED's.
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+Every white PCB was meant to be screwed onto the structure, using 2 screws each. This many screws seemed a waste of time, as each light holds 32 of these white PCB's. I therefore went with the alternative of printing clips, that hold the LED circuitboards in-place on the structure. The LED's used are high-efficiency medium-power, so the temperature doesn't surpass beyond 45°C on max intensity. Which doesn't result in any danger of melting the PLA clips.
-Each light holds 32 white LED pcb's, which require two crews each. This many screws wastes a ton of time, as an alternative clips where created to hold the LED circuitboards in-place on the structure. It are high-efficiency LED lights, so their temperature doesn't surpass beyond 45-50°C on max intensity. A center holder was also 3D printed to keep the control circuitboard in place, the LED drivers can become hot so a little air-gap was foreseen to avoid melting the plastic.
+I also programmed the LED-driver pcb's firmware, so that the actual maximum configurable intensity is around 70% of the rated LED current. LED's their efficiency and durability lower drastically above 70%, as more heat is generated. Heat is mostly the reason why commercial LED's tend to die way faster than they're rated for. So I hope these lights last many many years.
+A center holder was also 3D printed to keep the control circuitboard in place, the LED drivers can become hot so a little air-gap was foreseen to avoid melting the plastic.
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 ===== Installation =====
-The installation was rather easy, using nearly invisible fish-wire with decent weight rating.
+The installation was rather easy, using nearly invisible fish-wire with decent weight rating. The LED's are however extremely bright on max setting, thus are mostly used around 15 to 40% intensity.
+I also added a little bash script on my Linux desktop, so that:
+  * Pressing F9-F10, changes the light temperature up/down
+  * Pressing F11-F12, changes the light intensity dim/brighter
+  * Holding shift when pressing the above buttons, changes the second ceiling lights configuration.