Moving light spot, wash or beam: what is the difference?

Decide what must change during the show

Is the fixture moving between acting positions, changing the colour of a stage wash or creating visible aerial effects? Those are different jobs. A broad wash should not be selected simply because a narrow beam fixture looked impressive in a concert photograph.

Write the required result in ordinary language. For example, ‘cover this group of performers and change colour between scenes’ gives the supplier a clearer starting point than ‘something moving and bright’.

Read the specification for the actual model

Check beam or zoom range, focus, shutters, gobos and colour features where relevant. Not every spot has framing shutters, and not every fixture with a broad zoom behaves like a dedicated wash. The throw distance and stage dimensions help determine whether a feature is useful in the room.

• Coverage needed at the actual lighting position.
• Whether a defined edge, pattern or framing is required.
• Colour and transition requirements.
• Control-system compatibility and programming time.
• Noise considerations for quiet performances.

Allow for programming and the environment

Movement and effects need a control plan and time to programme. Include who operates the system and how the cues fit the show. A sophisticated fixture does not create a finished lighting design when it is first powered on.

If the desired look depends on seeing beams through the air, discuss whether an atmospheric effect is appropriate and permitted. Haze is a separate venue decision, not an automatic part of moving-light hire. Plan a lighting result that still makes sense if it cannot be used.