N scale doesn't exactly have many options for working signals, especially dwarf signals. I was happy to see these in one of the hobby magazines. I purchased them with the companion LED's.
The instructions were very clear on how to install the LED's. As well as drilling out a hole for the light to shine through the front of the signal, I also had to use a rotary tool to remove some material for the LED to fit inside. I mounted the signals to a short piece of wooden dowel to make it easier to install on my layout. I also added larger gauge wires to the leads. I connected each signal to a Digitrax SE8C signal decoder using their terminal strip mounting kit. JMRI controls the signals based on block occupancy and turnout position. The mounting kits include a 100 ohm resistor so I added a 270 ohm resistor to reduce the current to the recommended value. I'm happy with the brightness and color. I did find out with help from Showcase Miniatures that the included stamped metal piece contains the back cover and a couple of other pieces intended for another product. So you only need the back cover piece. The rest can be discarded. I'm very happy with the results.