Harmonic Behavior of Different Branded LED Lamps and Their Respective Cost Effectiveness Soo Chin Chong 1 , Dur Muhammad Soomro 2 Faculty of Electrical and Electronic Engineering, UniversitiTun Hussein Onn Malaysia, 86400 Parit Raja, BatuPahat, Johor DarulTakzim, Malaysia tamama_chin@yahoo.com.my,dursoomro@uthm.edu.my Abstract .Changing incandescent lamps and Compact Fluorescent lamps (CFL) to light emitting diodes (LED) is one of the ways in enhancing energy efficiency in a building. LED lamps consume less power, longer lifespan and are environmental friendly because it is recyclable and does not contain mercury. However, LED lamps like CFL lamps create power quality (PQ) problem. LED lamps using electronic driver intended for changing AC to DC supply, switching and shifting of the driver can cause harmonic distortion for the connected system. Connecting a massive number of LED lamps can cause problems to the grid with the generated harmonic. This paper analyses the harmonic behavior for different branded of LED lamps based on IEC 61000-3-2 standard. Simulation of LED lamps will carry out by PSCAD/EMTDC soft- ware. Good quality LED lamps will produce lower harmonic distortion and the prices are also reasonable, so it can be high economical for the consumer. Thus, cost-effective of using LED lamps will be included in this paper. Keywords: LEDs, total harmonic distortion (THD), cost saving. 1 Introduction World energy consumption increases continuously which has created increasing carbon emission to the atmosphere. Carbon emission is the main source of global warming. Therefore, Malaysia government had intended to decrease energy consumption by improving energy efficiency. Based on Suruhanjaya Tenaga Energy Commission Year 2013 statistics record, 123,076 GWh final energy demand was recorded for Malaysia nation energy consumption. For residential and commercial sectors they consume about 54%, the industrial is close to 46%, and transport & agriculture is consuming less than 1% [1] [2]. For industry sector, lighting consumes around 5% of the total energy consumption. For residential and commercial building, lighting consumes about 20-30% of the total energy consumption. Recently, LED lamps have become popular as the replacement of incandescent lamps and CFL due to its lower power consumption, longer lifespan, does not contain