LED Lighting FAQ

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LED Lighting FAQ

  • What's the difference between CRI and CCT

    Usually, there are two key measures used to valuate lighting sources: Color Rendering Index (CRI) Correlated Color Temperature (CCT) CCT measures the color of a light source by using Kelvin (K) temperature, which indicates the warmth or coolness of a lamp’s color appearance. The lower the Ke...

  • Why is the life span of an LED measured as lumen depreciation

    The life span of an LED is vastly longer than that of incandescent, fluorescent or HID lamp sources, generally lasting 50,000 hours or longer. Although the LED never really burns out, product life span is measured by lumen depreciation. The Illuminating Engineering Society's (IES) current standa...

  • How to evaluate LED lighting products

    To fully evaluate an LED lighting product one needs to review the overall system efficiency, optical control, thermal management of the LEDs, and know at what point in time the fixture will reach 30 percent lumen depreciation. LED lights with good optical efficiency and thermal management ...

  • Single end power LED tube and Double end power LED tube

    If it is single ended powered LED tubes, need to power only one end. This type of installation is referred to as unshunted. If double ended powered LED tubes, need to power both ends, one with line source, the other end with neutral. This type of installation is referred to as shunted. Led tubes ar...

  • Why is LED a Green and Eco-friendly technology

    LEDs are environmentally friendly in many aspects. Firstly, unlike HID (High Intensity Discharge) lamps LEDs contain NO mercury. In addition, some LED luminaires are RoHS (Restriction of Hazardous Substances) compliant and have been designed to provide more than a decade of near maintenanc...

  • What is LED and its advantages

    Light emitting diodes (LEDs) are solid-state lighting components. Each individual LED consists of a semiconductor diode that emits light when a voltage is applied to it.  LEDs can be many times more energy-efficient than light bulbs, depending on the application. LED lighting can save up to 85...

  • Difference between isolated driver and non-isolated driver

    The isolated power supply use a transformer to transform AC110V or AC220V voltage down to a lower voltage, then rectified into DC output. Because the primary coil of the transformer will withstand  AC110V or AC220V voltage, the secondary coil is exposed only to low AC voltage output, and t...