Comment by aurizon

Ali-express = cheapest, Amazon faster. They have long strips of LED lights, some one color, some various whites of whatever K you desire. Getting more complex there are several types of addressable chips and controllers to do this. Cheapest is white arrays of the white you like, typically 8 foot strips you attach as needed or buy the accessory attachment strips in 2 foot shippable lengths, in aluminum or plastic to make ceiling/edge/window lights as you wish. Costs range for $10-15 for each 8 foot length (addressable a bit more). Addressables are made on 3-4 different base chip types. youtube has detailed explanations and builds on the various chip families. I find occasional LED sales booths at the Rancho Cucamonga flea markets, and probably at all the larger ones, with full sales/demo setups you can buy then and there or get them online and save a little. Watch power supplies and look for proper UL/approved wall warts - many are fake UL, so check for isolation between +/- and both AC line prongs as the fakes UL often lack isolation and 2 different ones 'can' have full AC on different prongs and a shock hazard might exist -be wary. 12 volts is the common voltage used and if you use USA made wallwarts you can avoid these risks.