Translate the equipment list into a lighting result
If an offer says “wash lights and moving heads”, ask what each group will illuminate. A moving head describes a fixture that can change its direction; it does not tell you whether it creates a broad wash, a shaped spotlight or another effect. “LED” describes the light-source technology, not the whole visual function.
For a client, the most useful questions are: how wide is the intended area, how precisely must its edge be controlled, and must the aim change during the programme? Answer those before comparing quantities in a lighting rental list.
A short guide to the main terms
| Term | General function | Question for your proposal |
|---|---|---|
| Wash or flood | Light across an area | Does it cover the required surface without unwanted spill? |
| Fresnel | Adjustable light with a soft beam edge | Can adjacent areas blend into the required coverage? |
| Profile | More precise beam shaping and pattern projection | Can it keep light off the screen or define the product area? |
| Moving head | Remote changes of direction and model-dependent features | Which changes are needed, and what type of moving fixture is proposed? |
| Linear or batten fixture | A lighting source arranged along a length | Is the intended result a wall wash, scenic line or visible effect? |
ETC's education guide describes these optical and control differences. See its chapters on luminaires and lighting systems. The terms are useful shorthand, but the supplier should verify the chosen model's capabilities.
Soft edge does not mean an unimportant job
A presenter may need to move through several adjacent lighting areas without stepping into a visibly dark gap. Ask how that continuous area is created and checked. A product may need a more contained accent so nearby graphics remain readable. Neither task is inherently more advanced; they need different control over the result.
ETC's Fresnel documentation illustrates a fixture intended for an adjustable wash. The product page shows an example of this category. It is not evidence that this model is required or included in a REX Lab offer.
Movement is useful when the programme needs it
A moving fixture can be valuable when focus shifts between speakers, a reveal and a performance. Ask for the planned states and transitions. If its direction never changes and no other feature is used, ask why that choice suits the project. There may be a sound practical reason, but it should be explained.
Do not assume that one moving fixture can serve two simultaneous positions. At each moment, the design still needs to cover every subject that must remain visible. Include programming, testing and an operator where the sequence depends on live cues.
Worked example: a simple awards presentation
Imagine a hypothetical stage with a central speaking area, an award table to one side and a screen at the back. The programme alternates between a speech, an award handover and a short performance. No fixture quantity is prescribed.
Ask for continuous coverage of the speaking and handover areas, a separately controllable table accent and a defined performance look. A supplier may propose wash fixtures for general coverage, profiles where containment matters and moving fixtures for changes during the performance. Another valid design may use mostly fixed fixtures with separate controls.
Compare both through the running order. Does the presenter remain visible while the award is collected? Is the screen readable? Can the transition happen at the required moment? Which option takes more preparation or changes the visual result? This makes the equipment comparison understandable without requiring the organiser to learn every model name.
Questions often hidden behind the fixture name
Which lens or beam setting is included for the actual working distance?
Are shaping accessories, mounts and control equipment in the scope?
Does the required colour or camera appearance need a test?
Who sets the final focus after scenery is installed?
Who checks the full sequence with performers or presenters?
Typical mistakes include asking every wash to create a crisp logo, selecting a moving head without defining its optical job, or approving a product list without installation positions. Ask for a functional lighting plan and a proposed check of each important scene.
Turn the glossary into a decision
Send the programme, stage plan and subjects to illuminate through design and visualisation. Request AV rental with each fixture group labelled by its purpose. That is enough to have a useful selection conversation without replacing the lighting designer.