Extra Light and Communications
David does not allow white light in a dark investigation. He feels it distracts the entities because they are not used to bright white flashes when they are out and about at night. His personal flashlight is a 385nm UV LED unit, although he carries a white light model for emergencies. Even his headlamp is a red LED used for equipment checks and such. The two-way radios are his lifeline since he investigates alone, insuring that if he falls, or is injured or threatened, help is close by.