A Simple Inexpensive Designing Process of Diffuser Suitable for LED Tube

Abstract

Uniform illumination is an essential optical requirement for Light Emitting Diode (LED) lighting. This paper presents a simple, inexpensive designing procedure of efficient diffuser for uniform illumination of LED tube light. We demonstrate here some acid etched ordinary glass diffusers, and study the uniformity and absorption coefficient of these diffusers to compare their performance with till date market available diffusers. To achieve this goal, model samples were prepared by etching. Etched surfaces were observed by optical microscopy and scanning electron microscopy (SEM). Surface morphology was used to examine the grains size of the etched surface of the tubes. Our investigation showed that grain size and absorption coefficient of the surface increased with the increase of the etching time. Uniformity of the etched diffusers also increased with the increase of the etching time and reaches to a certain optimum level with 16 minute etched tube. Absorption coefficient at this level is just 8.66%, while it is 17.14% to 31.27% for different market available diffusers.