Zilla Daylight Full-Spectrum Fluorescent T5 BulbsEnhance the natural beauty of terrariums and coloration of reptiles. The Daylight full-spectrum T5 bulbs provide visible light output in the 6,700K nanometer range. This helps bring out subtle colors in a reptile's skin that makes everyday viewing more dramatic. Daylight lamps emit a high-intensity light output that simulates natural sunlight which generates the photosynthetic energy to stimulate lush plant growth, making this ideal for terrariums with live plants. Daylight bulbs are designed for 3,500 hours or twelve full months of average use. Replacement Bulb for Zilla Low Profile Double T5 Fixtures. Ideal for use with Zilla Combo Halogen/Fluorescent Fixtures - for reptiles and amphibians that requires light and heat but not UVB.