Which key aspect of theatre did David Belasco use to advance lighting techniques?

David Belasco is recognized for his significant contributions to the evolution of theatre lighting techniques, particularly through his innovative use of advanced technology for stage lighting. He was a pioneer in incorporating electric lights into theatrical productions, which allowed for greater control over the lighting environment than had previously been possible. This advancement enabled designers to create more dynamic and varied atmospheres on stage, enhancing the overall impact of the performances.

Belasco's emphasis on realism and mood in his productions made the use of advanced lighting technology a critical element. By manipulating lighting in ways that reflected naturalistic conditions and emotional undertones, he elevated the aesthetic experience of theatre, making it more immersive for the audience. This approach set the stage for the modern practices of lighting design we see in contemporary theatre today.