What is the difference between the 2ft and 4ft UV Fluorescent Tube Lighting and the area covered?

The 2ft fixture is suitable for smaller spaces and focused applications, while the 4ft fixture provides greater coverage for larger rooms and event spaces.

For Black Light / UV-A (Decorative/Entertainment), a 2-foot tube has an effective visible reach of about 10 to 15 feet in a dark room. It can cast a glow over an area of roughly 100 to 150 sq. ft. A 4-foot tube can cover up to double that.