Zilla 100011476 Desert Series 50 T8 Fluorescent Bulb, 32 Watt, 48 Inches Manufacturer:Zilla Part Number:100011476 Features:Provides UVB light for proper calcium development in desert reptilesFull spectrum illumination brings out subtle reptile colorsFits popular size light fixtures32 watt full-spectrum T8 fluorescent bulb1″ diameter x 48″ long (from end of pin to end of pin)To maintain UVB effectiveness, replace bulb every 3500 hours or 12 months Reptile Lighting Guide: Desert Series bulbs are ideal for these desert-dwelling reptiles:African Fat-Tailed GeckoBearded DragonsBlue-Tongue SkinksEmerald SwiftsLeopard GeckosNile MonitorsRed-Footed TortoisesSavannah MonitorsSchneider’s SkinksTegusUromastyx UVB / UV Index: UVB Intensity and UV Index based on distance from bulb:0″ – 4″: Up to 100 Microwatts UVB @ 4″, UVI 5>4″ – 12″: Up to 50 Microwatts UVB @ 12″, UVI 2 – 512″ – 18″: Up to 25 Microwatts UVB @ 18″, UVI <218" – 24": Up to 5 Microwatts UVB @ 24", UVI <1 Bulk Pricing For customers who wish to order large quantities of this item and would like to receive bulk pricing, please contact us directly and we will provide the best price possible.