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Home > Technology > How to Choose the Correct Light Guide?

Select Light Guide on Its Outer Surface, Side Wall, Exit and Corner

How to choose the correct light guide? We can choose it from its outer surface, side walls, exit, corner and shape.

  1. The smoothness of the outer surface of the glass light guide is an important guarantee for the normal operation of the light guide.
  2. The side walls of the light guide parallel to the direction of light propagation should be very smooth, like a mirror, so that the light can produce complete internal reflection on its surface. The inlet of the light guide should be smooth and matched with the LED shape to ensure that the light enters the light guide with minimal reflection and scattering.
  3. The exit of the light guide should be scattered and can be made into any shape, cylindrical, square, tapered or any special shape (arrow, star, half moon, etc.).
  4. For rectangular and special shape of the light guide, the corner must be rounded and the radius of it should be not less than 0.5 mm, can not have sharp corners to ensure that the lighting of corner.
  5. The shape of the light guide should gradually change along its length.
Mechanical Property of Glass Light Guide
Mechanical Property Reference Value
Density 2.203 g/cm3
Comprehensive Strength > 1100 MPa
Bending Strength 67 MPa
Tensile Strength 48.3 MPa
Poisson's Ratio 0.14–0.17
Elastic Modulus 71700 MPa
Shearing Modulus 31000 MPa
Moths Hardness 5.3–6.5 (Moths Scale)
Deformation Point 1280 °C
Specific Heat (20–350 °C) 670 J/kg °C
Thermal Conductivity (20 °C) 1.4 W/m °C
Refractive Index 1.45845
Coefficient of thermal expansion 5.5×10–7 cm/cm °C
Hot work temperature 1750–2050 °C
The temperature for a short time 1300 °C
The temperature for a long time 1100 °C
Resistivity 7×107 Ω.cm
Dielectric Strength 250–400 kV/cm
Dielectric Constant 3.7–3.9
Dielectric absorption coefficient < 4 × 104
Dielectric loss coefficient < 1 × 104

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