Reference Light Research

Owned by Fatima
Last updated: Mar 10, 2023 by Ryan Miller
2 min read

 

  • Final light pattern generated by an LED is the result of:

    • Light directly refracted by the encapsulating lens, the light internally reflected inside the lens, and the light reflected by the reflecting cup

      • Dependant on the geometry of the reflective cup and the encapsulating lens

  • An LED is a directional light source, with the maximum emitted power in the direction perpendicular to the emitting surface

  • Typical radiation patterns of LED’s show that most energy is emitted within 20 degrees of the direction of maximum light. 

    • Plastic lenses can be used to spread light for greater angles of visibility

      • We may have to do this as some of the lights require larger/smaller angles 

  • LED’s are available in a wide variety of beam patterns

 

  • Could we potentially use lenses (to cover the problem for the wrap turn indicators)?

  • For the light covers, the smaller and the rounder is better (smaller surface area = less air resistance, but also have to consider the drag coefficient) refer to the image below 

shape effects on drag

  • Reflectors → will research more on this

    • Matte  = widen the beam pattern; soften the lit appearance (enlarge the emitting surface)

    • Metallic = polished steel aluminum or stainless steel can be adequate as reflectors but will develop an oxide layer overtime 

      • Mostly used for price or for decorative purposes 

      • Coated metal parts are preferred to meet more stringent surface quality

        or high reflectance requirements 

      • Robustness and heat sinking potential are two strengths while weight and cost are two weaknesses