If moving bees at night, use red light. If you don't have a red flashlight, red cellophane (look in the gift wrap section of a store) over a regular flashlight works.
Bees seek body heat of beekeepers and land on their suits. If working with bees at night, these flying heat detectors are attracted to your body warmth and stay on your suit. After you finish with the hives, Standing under a bright light such as a porch light is one way to get them to fly off.