Question: what is the difference between 1 way and 2 way dimmer switch?
Answer: 1 Way Switches: If a light switch is '1 way' this means it is just an on/off switch. ... The single switch controls a single light (or lighting circuit). 2 Way Switches: A '2 way' switch means there is another switch controlling the same light. These are often used on a stair case, large room with switches by each door.