An array of exit points are distributed on the LGP to ensure that the luminous flux from all the LEDs is distributed homogeneously over the entire LES. The light guide is designed with exit points which allow a controlled amount of light to escape from the light guide. The LGP transports light from the edge-mounted LEDs to a point at some distance by means of total internal reflection (TIR) with minimal loss. The luminous flux from edge-mount LEDs is regulated by a multi-layered optical system which typically consists of a top reflector, a light guide panel (LGP), and an opal bottom diffuser. How edge-lit optical systems workĪn edge-lit LED panel light features an extruded aluminum frame which provides mechanical support for the light source and optical components while serving as a heat sink that dissipates heat generated in the semiconductor junction of the LEDs. LED panel lights can be made with an exceptionally thin profile (less than 10 mm), which allows the fixtures to easily fit shallow plenum ceilings. All these optical designs require the fixture to maintain a certain depth. Volumetric troffers make use a perforated or opaque basket to shield glare while indirectly bouncing light to create a diffused LES. Lensed troffers rely on diffuser optics to soften the harshness of LED light.
Parabolic troffers use aluminum louvers to control glare. The limited dimensions of their light emitting surfaces present an extra design challenge because the concentrated brightness of the high flux density light source must be distributed on a larger surface in order to create an acceptable luminance which is not harsh to the eye. Optical design of conventional troffersĬonventional troffers typically are deep and cumbersome fixtures because optical systems designed for these luminaires take up a substantially large volume. LED panel lights, as with other types of troffer lights, are sized slightly smaller for lay-in grid installations. In a typical grid ceiling, a T-bar structure provides a grid of square or rectangular openings with a cell size of 2 by 2 feet (610 mm × 610 mm) or 2 by 4 feet (610 mm × 1,220 mm) in the United States and its neighboring countries, or 600 mm × 600 mm or 600 mm × 1,200 mm in Europe and China. LED panel lights are a type of troffer lights which also include volumetric troffers, parabolic troffers, and lensed troffers. Light fixtures of this type are commonly referred to as troffer lights. Overhead lighting from suspended ceiling systems is provided in the form of recessed lighting which sits flush with the ceiling surface. Light fixtures, sprinkler heads, air diffusers or grills, fire detection devices, and sound systems can be recessed into the T-bar grid in the place of ceiling tiles. A drop ceiling consists of a metal framework normally made of aluminum or steel, in which the ceiling tiles are dropped or clipped into the T-bar rails to produce a finished ceiling for a space. A drop ceiling (also known as suspended ceiling, false ceiling, or grid ceiling) is a secondary ceiling that is hung below the main structural ceiling to provide a clean ceiling aesthetic and acoustic insulation, as well as a concealed space to hide mechanical ductwork, electrical conduit, plumbing lines, and the original ceiling. However, these flat panel LED lights are most commonly installed in drop ceilings that are frequently found in in offices, educational and medical facilities as well as commercial buildings. They can also be suspended over workstations or meeting room tables to deliver task lighting.
LED panel lights can be surface mounted to flat ceilings and serve as a flush ceiling light. Providing totally uniform, smooth and visually comfortable lighting, edge-lit LED panel lights offer very compelling reasons to switch from fluorescent light fixtures as well as other types of LED ceiling lights. General and task illumination for commercial buildings has been challenged to deliver even distribution of illuminance across an area or a task plane while offering excellent glare control and visual comfort. directional emission and compact sizes) and uses an innovative optical design to enable an extremely low profile architecture and homogeneous luminance over the entire LES. The revolutionary technology takes advantage of the characteristics unique to LEDs (i.e. An LED panel light is a surface emission device that makes use of edge-lit technology to achieve consistent uniformity across the light emitting surface (LES) of the luminaire.
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