Spotlights are electric In its most basic form, a spotl […]
Spotlights are electric
In its most basic form, a spotlight is the basic circuit. The power supply (depending on the model of the spotlight, either AC or DC) is connected to the high-intensity bulb via a switch. When the switch is moved to the "on" position, the mechanism inside the switch completes the circuit and allows current to flow from the power source through the lamp and back to the power ground path. The filament in the bulb prevents the current from passing and starts to glow when the current forces it to pass. In some very efficient spotlights, current is fed into a small circuit board, which in turn illuminates a set of high-intensity light-emitting diodes (LEDs) to produce light.
Spotlights are reflective
Although the current illuminates the bulbs in the spotlight, the bulb alone is not known to produce a large number of spotlights. In order to amplify the light generated by the bulb, the concave area around the bulb is coated with a highly reflective inclined material. Angles within the material capture and reflect the light from the bulb, magnifying its effect. This reflective area is usually composed of aluminized plastic, which can also redirect light into a stable beam, thereby enhancing the lens's function. Depending on the size of the spotlight and the reflectivity of the coated area, a single bulb or a small number of LEDs can be amplified to 10,000 lumens or more (125,700 candlelights).
Spotlight using lens
When the spotlight's bulb and reflective area produce a lot of light, the natural tendency of the beam is to diffuse into a wide, unfocused area. Because scattered light waves will produce ineffective spotlights, manufacturers often use special plastic or glass lenses to cover the bulb and reflective areas. Just like the lens of a camera or glasses, a lens on a spotlight directs light from a light source to a single focus path. Depending on the brand and model of the spotlight, the lens may be adjustable, allowing the user to switch from a dimmer covering a large area to a very bright focused light focused on a small surface.