Sunpark (120-2128), One Lamp - 21, 28 watt Electronic Ballast, 120 volt. Operates - 1 or 2 - F21T5, F28T5. Amps - 0.35/47 amps, Power Factor - 0.50, THD - 130%, Ballast Factor - 0.88. Minimum Start Temperature - 32 Degrees F. Size: Length - 8.3", Width - .95", Height - 0.90". Rated - UL / uUL, Crest Factor < 1.70, Sound Rated A, Class P, Outdoor Type 1, EMI: Meet FCC Title 47, Part 18. # 112262