(Pack of 10) PLT-42W 835, 42-Watt Triple Tube Compact Fluorescent Light Bulb ...
42 watt, T4, 4-Pin GX24q-4 Base, 3,500K, Triple Tube,  Compact Fluorescent  Light Bulb. ~   Compare to: Sylvania 20871 - CF42DT/E/IN/835, Philips 268755 - PL-T 42W/35/4P/ALTO, GE 97635 - F42TBX/835/A/ECO