25PK 4ft Instant Fit T8 Tubes, 1800 Lumens, 13W, 4000K or 5000K Kelvin:4000K Thermally Protected (auto reset)

Thermally Protected (auto reset)

The answer is both

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The Keystone 175W five-tap pulse-start metal halide ballast kit from Warehouse-Lighting

25PK 4ft Instant Fit T8 Tubes, 1800 Lumens, 13W, 4000K or 5000K Kelvin:4000K Thermally Protected (auto reset)naturaLED Instant Fit T8 easiest way to upgrade your fluorescent fixture to an LED lighting system. Our Instant Fit T8 fits into an existing fluorescent lighting system. Utilizes the existing electrical T8 fluorescent ballast without re wiring. Our instant fit tubes come in variety of lengths from 2 ft, 3 ft, 4 ft, and 8 ft.