For modelers working in HO Scale, there is a collection of Swan Neck, Industrial Building,Carriage, Globe, and Highway lamps together with a range of fibers and connectors, and 2 different sizes of lights sources, the Lamplighter™ boxes.
The Lamplighter boxes come in two sizes, the Lamplighter 2 box which is the larger of the two and HO scale folks are buying to light larger sections of their complete layout, and the Lamplighter 1 box which is for smaller sections or small layouts. Note that the Lamplighter 2 box doubles the number of fibers that can be inserted, and provides 30% brighter light than the Lamplighter 1 box.
The best fiber to use with this gauge is the 1.5mm fiber as it provides plenty of light for buildings. The various fiber diameters provide you with a collection of different intensity lights and different flexibility of fibers. The 0.5mm fiber is well suited to applications such as lighting cars, trees, etc. Note that most of the pre made lamps come with 3+ft of 1mm fiber, the Ind.Bldg. lamps with 3ft of 0.75mm fiber and the Highway Lamps with 3ft of 1.5mm fiber.
If there is a need to connect fibers together, there are Fiber Connecting kits that are suitable for connecting 1.5 to 1.5mm, and 1.0 to 1.0mm fibers. They can also be used to connect different sized fibers together, such as multiple 0.5mm fibers to a 1.5mm fiber. This is useful when lighting small objects such as car lights using 0.5mm fiber but then running a 1.5mm fiber back to the Lamplighter box.
What to buy for a first order:
A Lamplighter 1 or 2 Starter Kit which will include 30ft or 60ft of 1.5mm fiber.
Add lights now or later. Add in 1.0 fiber to add experimentation.