Currently adding a house extension which will have a roof lantern. I want to run a strip of WS2801 LEDs around the inner bottom edge to have some fun with (think "disco lantern"!). Electricians are currently on-site and I want to get the right cables in the walls.
I'll be using 2 x 5m reels meaning 320 leds. If I've understood the power needs correctly, WS2801 is about 60 milliamps per LED max meaning a 20amp supply should be enough. Is that right? I don't think they'll ever be all at full power but I want to allow for it as changing cabling later would be disruptive and expensive.
The power supply and controller are going to be in the corner of the room - about 5m away from the lantern in terms of cable run. I was considering running a small 2-core cable for data and then appropriate cable for power.
I have two questions about this. For the data - what is an appropriate cable? I've no idea what the issues may be around data loss over a 5m length. The controller will be small (Arduino or PI) so I could find a home for it up in the lantern, but I'd prefer to keep it more accessible if I can.
Regarding power - I'm expecting to need at least one connection per LED strip, more likely two. Question is, should I spur from a single power cable run to the base of the lantern (If I'm right about 20amp this should do) or am I better off running multiple, smaller cables direct from the power supply?
My electricians should be able to advise on this stuff I know but they've clearly not come across someone wanting to do something this ridiculous before and I'm getting blank faces from them.