Final answer:
The field became brighter when the six floodlights suddenly switched on and illuminated the entire field.
Step-by-step explanation:
When the six floodlights suddenly switched on and illuminated the entire field, the field became brighter. The light emitted from the floodlights spread evenly in all directions, creating a well-lit environment. This increase in illumination made the field much brighter than before, allowing for better visibility and visibility.