The previous information was in error due to a crappy multimeter. After consultation with an engineer friend. I found out that the initial resistor " ...
What to do with discarded LED PCBs? Use them as desk lamps! Duh! A while ago I recieved these 12" strip PCBs with 30 high intensity LEDs on each. I took 4 and attached them to a board to see how much light they would emit together. Turns out that they put off what appears to be about the same as a typical 18 inch flourescent undercabinet fixture. I now have two that illuminate my computer desk.
Because these strips do not weigh much and also do not creat much heat at all I chose to secure them with cable ties. Also, I had these laying arround, so why not? I then took the scrap 3/4" thick board and measured to length and width and cut with a handsaw. I think the dimensions ended up being about 12" long by 6" wide. Lastly the mount holes for the cable ties had to be drilled. I drilled these a little narrower than the strips. One pair at each end.
Step 2: Spacer Fabrication
The strips still needed to be spaced off of the board to allow the wires to have room. I took the nylon casing / tubing that the strips were originally installed and cut them to about an inch long each and cut the top of the tubing off lengthwise. I then inserted the strips into these at each end and cabletied everything together.
Step 3: Installing the Fixture
Each fixture was mounted underneath my book shelfs using 4 1" drywall screws. The power cable is a 2 wire 14 AWG cable, which was ran through the cabinet in the corner and through the top where the transformer sits.
Step 4: Electrical Connections
This was the easiest step of all. These strips have miniature molded plugs that allowed them to be daisy chained together. I just pluged each one together and then attached the two leads from a 120 volt primary / 24 volt 40 volt-amp secondary transformer.
Bio:I am in my third year of my electrical apprenticeship. This is my second career; formerly I was in the firefighting / EMS field. I enjoy my work and am always curious about new hardware (devices, wi...read more »