Compact Fluorescent Hardwire Ballast Features:

• Auto Restart After Hot Relamp
• Deactive Lamp Protection Circuit
• Flicker Free Operation
• High Power Factor
• Low THD
• 100% Factory Tested
• High Reliability
• No Audible Noise
• True Preheat Starting
• No Starting Aid Required
• Energy Efficient
• High Frequency Operation
• Solid State
• Moisture and Shock Resistant
• No PCBs
• Bottom Feed Models Available

http://www.hatchlighting.com/products/fluorescent-ballasts-and-lamps/legacy-products-3/21-watt-compact-fluorescent-ballast.html ; http://www.hatchlighting.com/media/productPDF/Hatch_FR_L_and_LH_10_38_CFL_8.pdf