LGP Selection Guide: Choose the best light guide for your LED panel light


LED panel light is a high-efficiency, energy-saving, environmentally friendly lighting fixture, and the light guide is an important part of it. The light guide plate material absorbs the light from the lamp beads to stay on the surface of the plate, and when the light is shot to each light guide point, the reflected light will spread to all angles and then destroy the reflection condition by the front of the light guide plate. The light guide plate can make uniform light through a variety of evenly distributed light guide points. The common materials of light guide plates are PMMA, PS, glass, etc. They have their advantages and disadvantages. KingOrnan, as a professional LED panel light manufacturing factory, will introduce how to choose the right light guide for your market from chemical composition, physical properties, production process, cost, etc.

LGP Selection Guide: Choose the best light guide for your LED panel light

LGP chemical composition difference

LGP chemical composition difference

PMMA is chemically called polymethyl methacrylate, a polymer compound made by polymerizing methyl methacrylate.
PS board is commonly known as “organic board,” with polystyrene as the main raw material, extruded thermoplastic.
The glass composition of silica and other oxides, the chemical composition is Na2SiO3, CaSiO3, SiO2 or Na2O-CaO-6SiO2, etc., is a kind of irregular structure of the amorphous solid.

LGP Physical properties

Acrylic is an excellent polymer transparent material density of 1.18g/cm3 light transmission rate of 92%. PS board density of 1.05g/cm3, a light transmission rate of 88% to 92%, transparent material in the plastic second to acrylic and other acrylic polymers. The density of glass is 2.5g/cm3, and the light transmission rate of 85%.
Comprehensive features are: PMMA has good light transmission, high-temperature resistance, and is easy to form. Flexibility, elasticity, and impact resistance are eight times the glass. PS board yellowing aging resistance is poorer than acrylic, mechanical processing properties and thermal processing properties than acrylic, water absorption, and thermal expansion coefficient are less than acrylic, and the price is cheaper than PMMA.

Production process

PMMA/PS light guide plate production process

PMMA/PS light guide plate extrusion molding is done with the help of screw and plunger extrusion so that the plasticized uniform plastic is forced through the die mouth and becomes a continuous production with a constant cross-section. The extrusion process is as follows: add material – melt plasticization in the screw – extrusion of the head mouth die – shaping – cooling – traction – cutting. The features of extrusion molding are continuous, high efficiency, stable quality; wide range of applications; hygienic production environment, low labor intensity; suitable for mass production.
On the bottom side of the optical grade acrylic sheet with laser engraving, V-shaped cross grid engraving, and UV screen printing technology printed with light guide dots. The use of an optical grade acrylic sheet to absorb the light emitted from the lamp in the optical grade acrylic sheet surface stay; when the light is shot to each guide point, the reflected light will spread to all angles and then destroy the reflection conditions by the front of the light guide plate. A variety of sparse, different sizes of light guide points can make the light guide plate uniform light.

Glass light guides the production process

Glass light guides the production process
  • Raw material pre-processing: crush the lumpy raw materials (quartz sand, soda ash, limestone, feldspar, etc.), make the wet raw materials dry, and remove iron from the raw materials containing iron to ensure the quality of the glass.
  •  Compound preparation.
  • Melting: The glass compound is heated at a high temperature (1550~1600 degrees) in the pool kiln or crucible kiln to form a liquid glass that is uniform, free of bubbles, and meets the requirements of molding.
  • Forming: The liquid glass is processed into flat-shaped products.
  • Heat treatment: Through annealing, quenching, and other processes to eliminate or produce stress, phase separation, or crystallization inside the glass, as well as to change the structural state of the glass. 6. Cutting: Cut according to the required size.



Because of the price of raw materials and different production processes, the PMMA light guide is the most expensive, followed by the PS light guide, and the cheapest is the glass light guide. Therefore, the glass light guide is the best choice in pursuit of price only.
According to kingornan years of experience in exporting panel lights, in terms of import costs, some countries import goods by weight for customs clearance; that glass, the heaviest weight of the three LGP light guide, you can not only consider the cost of the product but also need to consider the cost of product import customs clearance.


After reading the above article for the panel light three commonly used light guides, you should have a three-dimensional understanding. Each material has its unique performance and use environment.

PMMA light guide plate has the advantages of high light transmission and heat resistance, not easy to yellowing, but expensive, suitable for high configuration panel lights. PS light guide plate has the advantages of a lightweight, impact resistance, and uniform luminescence. Still, the use of 2-3 years after the risk of yellowing, the price is moderate, suitable for general configuration of the panel lights. Glass light guide plate with high hardness, high light transmission, and corrosion resistance, cheap price, and other advantages and heavy weight can make the panel light on the hand texture better. Still, the high power will have the problem of dark light areas, suitable for pursuing a price panel light program.

Therefore, the selection of light guide plates needs to use according to market demand and product market positioning for comprehensive consideration.

>>For more information about LED panel lights, check out our other LED panel lights blogs.

>>Check out the latest styles, the hottest LED panel lights.


Get more information

Please leave your message if you have any questions about the products