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Directed Energy Weapons fire a beam transferring energy to a target for a desired effect. Beams of energy include using the electromagnetic spectrum, typically lasers or masers, or particles, particle beam weapons.
A flashlight directs light in the visible infrared spectrums but it is such low power as to not be harmful, though some searchlights are bright enough to cause permanent or temporary blindness. Directed energy weapons can use different areas of the spectrum to different effects. The term really applies to high-energy lasers, microwave guns, and to lesser extant particle beams. Since particle beams transmit matter as well as energy they are not purely a directed energy beam.
Some examples of directed energy weapons:
The major drawback of directed weapons is their high power consumption, limited range on lasers especially in inclement weather, and high production cost. Their future use in non-lethal weapon systems seems limited due to the generally perceived cruel nature of victim incapacitation. Some weapons of this type are already in testing for deployment as battlefield anti-missile weapons, such as in THAAD.