Basically, I hope it could be an INTERACTIVE INSTALLATION which would feedback with the lights(spectrum).
First, it would be triggered by the participants, and the more participants using it, the stronger the feedback would be.
Second, the interaction must be easy to control so that all the user could change the direction and focal distance.
And the most important is the small group has the equal ability to affect the installation, so they have to collaborate to achieve the goal or prevent each other from achieving their ideal stats.
The ideal scenario is in some public spaces where strangers would stay there for minutes. With this installation, strangers would connect and communicate with each other by the consequence.