Moreover, ballasts used in the residential sector are normal power factor (power factor approximately 0.3–0.5) ballasts,while industrial and business sectors are the most extensive users of higher power factor (power factor approximately 0.8–0.9) bal-lasts. So, the fluorescent T5 tube lamp was launched by the EGAT to promote fluorescent T5 tube lamps (28 W) to replace the existing fluorescent T8 tube lamp (36 W).