During their active growing season, Venus Fly Traps should receive a minimum of 12 hours of light (also known as a 12 hour photoperiod) with a minimum of 4 hours of direct sunlight, if you're growing your Venus Flytraps outside. In general, the more direct light the plant receives the healthier the plant will be.
Even without a brain to analyze what it's eating, the Venus Flytrap still manages to differentiate between insects and non-edible debris that might fall into its trap. ... It's guaranteed that at least one (if not all) of the trigger hairs will be tweaked by the insect's movement.