Elitco - T9 Circline Fluorescent Lamps, 4-Pin(G10q), 22W, 6500K Day Light, 920 lumen, Suitable for Indoor Lighting, Residential and Commercial, Hallways, Kitchen Lighting, Circline Fixtures
Philips 22W 8 In. Cool White T9 4-Pin Circline Fluorescent Tube Light – Hemlock Hardware
Aigostar - Fluorescent Tube Circular Round Neon Tubes T9 Lamp 21 cm 22 W Cool White 6500 K 1200 lm G10Q Socket Light Tube for Ring Lamp : Amazon.de: Lighting