AquaticLife 36" 39-Watt T5 HO 6,000K Lamp
The AquaticLife 34 inch, 6000K 39 Watt T5 HO Fluorescent Lamps are 34 inches from end of pin to end of pin (for 36 inch fixtures/retrofits).
The 6000K lamp provides a natural white light. It's appropriate for freshwater planted tanks and refugiums.
The AquaticLife T5 bulbs will work in any T5 fixture, as long as you are using bulbs of the same wattage as those currently in your fixture. T5 bulbs come in two categories, HO bulbs (24W, 31W, 39W or 54W) and NOs (9W, 14W, 21W or 28W). T5s are 5/8" or .625" in diameter.