International Journal of Scientific Research and Engineering Development-– Volume 3 Issue 4, July-Aug 2020 Available at www.ijsred.com ISSN : 2581-7175 ©IJSRED: All Rights are Reserved Page 455 The Study of Flickering Effect Present in Commercial LED Lights, Studies of their Optical Power and Driver Circuitry. Awareness Towards the Danger Aman Nagi*, R. Manohar**, Atul Srivastava*** *(Department of Physics, Lucknow University, and Lucknow Email: anagi.physics@gmail.com) ** (Department of Physics, Luckow University, and Lucknow Email: rajiv.manohar@gmail.com) ***** (Department of Physics, Luckow University, and Lucknow Email: pakami.as@gmail.com) ----------------------------------------************************---------------------------------- Abstract: We have examined the flickering effect and optical power fluctuation of commercially available different LED bulbs and bare LED strips. Comparison of optical power changes at 75% of maximum power supply voltage is done after using area under spectrum of these bulbs. Role of driver circuitry and their difference are also been discussed. The paper represents the ongoing problems in commercially available LEDs and drawing attention towards the importance of using safe light sources. Keywords — Flickering, spectroscopy, LED (light emitting diode), driver circuitry ----------------------------------------************************---------------------------------- I. INTRODUCTION A hazardous phenomenon which has been observed in LEDs is periodic modulation also known as flickering. The flickers below the frequency range of 100 Hz are called visible flickers whereas the flickers observed above 500 Hz frequency range are called invisible flickers. According to Solid-State Illumination System and Technologies (AISSIT); Flicker percentage above 20% is unacceptable for 100 Hz whereas more than 30% for flicker percentage is unacceptable for 120 Hz [1, 2]. Headaches, migraines, eyestrain, and even epileptic seizures etc. are some of the main diseases which are perceived from the flickering effect. It may also cause the increase in blinking rate of eye which causes concentration problems in human. [3, 4, 5] Some filters have been developed and for solving the problem of flickering, good quality SMPS’s are employed to provide continuous current to LED’s but a lot of improvement is necessarily required [6,7,8]. The requirement for standard norms and regulation is necessary specifically for the market flooded with low-cost LED bulbs. The present study aims at finding out the present status on flickering, optical power variation with power supply fluctuation and role of driver circuitry for the LED bulbs commonly available in the market. RESEARCH ARTICLE OPEN ACCESS