Shown is a 4 circuit CHASE. It is 4 circuits because there are four tubes, all lighting independently from each other.
This example of a CHASE pattern is called a "Bright Chase" because three circuits (neon tubes in our example) are lit at the same time. This is also referred to as "3 On/1 Off" chase pattern. Compared to a Dark Chase, which is 1 On/3 Off, a Bright Chase is less commonly used because the chasing effect is not as distinct. In addition, a Bright Chase unit is usually more expensive because, with more circuits being on at the same time, the unit must be made to handle a larger load.
The most common CHASE units are 3 and 4 circuits, however chase units can be many multiples of circuits. A 2 circuit unit will not typically achieve an appealing CHASE pattern and is rarely, if ever used.
You can have the chase pattern go from left to right, or right to left, simply by how you wire up the Chase unit.
