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What is the difference between HID and LED lighting?

April 11, 2011

Understanding HID Lighting
High Intensity Discharge (HID) lighting replaces the filament of a light bulb with a capsule of gas. The light emanates from an arc discharge between two closely spaced electrodes. This discharge is hermetically sealed inside a small quartz glass tubular capsule. HID lights require a ballast, which carefully regulates the voltage supplied to the capsule of gas. The amount of light produced is greater than a standard halogen bulb while consuming less power; this light more closely approximates the color temperature of natural daylight.

Understanding LED Lighting
Light-Emitting Diodes (LED) are light sources utilizing diodes that emit light when connected in a circuit. The effect is a form of electroluminescence where LEDs release a large number of photons outward; the LED is housed in a plastic bulb, which concentrates the light source.

he most important part of an LED is the semi-conductor chip located in the center of the light source. The chip has two regions separated by a junction. The p region is dominated by positive electric charges and the n region is dominated by negative electric charges. The junction acts as a barrier to the flow of electrons between the p and the n regions. When sufficient voltage is applied to the semi-conductor chip, the electrons are able to cross the junction into the p region.

Attached photos were taken by HID. LED separately. Obviously the photo is much dark and yellow by LED. But photo taken by HID is much better.(especially for bring out original color)

Although LED is common and popular nowadays. Compare with HID, the color rendering and high intensity(as we know, HID) is very different. LED also had some invisible myths, for example, the wattage do not equal to the brightness etc,.

Particularly when used on photo taking, HID is better than LED.

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