Technical Precision Replacement 55W Bulb for Kichler 4029 58W Circline Lamp - 9 Inch 2CT6-3500K - Amazon.com
2x18/30/58W Electronic Ballast T8 Linear Fluorescent Ballast for Home Office - AliExpress
Columbia Lighting JT822-232U6G-FSA12-EU Dedicated Lensed Troffer, (2) T8/U-Bend Fluorescent Lamp, 58 W Fixture, 120 to 277 VAC, Steel Housing | State Electric