Schematic of the Constant Watage Isolation Transformer type Ballast for High Pressure Sodium [HPS] - ANSI type S## lamps, and "Pulse Start" Metal Halide [MH] - ANSI type M## lamps.
Note the secondary winding - the Reactor - is electrically isolated from the primary winding, or the Line input.

Schematic of the Regulated Lag Isolation Transformer type Ballast.
Specifications similar to the above CWI Ballast.
Note that this one has two isolated secondary coils - one is the Reactor coil, the other is the Regulation circuit connected to the Capacitor.
I included a "Draining Resistor" in parallel with the Capacitors. It's function is to simply drain the residual charges that remain across the Capacitor after power has been removed.

Please feel free to ask questions, make comments, or participate in discussions on these Ballasts in the Theory Area under the topic heading of:

Discussions On: HID CW / Reg-Lag Ballasts

TIA!!! ASCII 'Ya!!!

Scott SET posted 07/29/2001 10:35:00 PDT
Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!