Some Bluetooth projector lenses can be connected to the lights in the hands of a Bluetooth smartphone or wireless earphone. However, halogen lamps projector lenses can also be used to light the lights in the background. While the projector lenses are pricier, halogen lamps projector lenses can be used with different lights and colors.
Laser projector lenses come in several colors and sizes. For example, Bluetooth projector lenses are the most commonly used Bluetooth projector lenses for cars.