Description R40 Medium Base 400w Inground Pool Light Bulb internal heat shield prevents separation, heat-resistant assures no loose bases, & brass base resists corrosion for swimming pool. R40 bulbs are a style of inground pool light bulb with a reflective coating on the inside of the bulb. Similar to other R-style bulbs, most R40 bulbs are frosted to create a softer light and reduce glare. Specially designed to keep your pool well lit this season. Our R40 Medium Base 400w Flood Pool bulbs use thicker filaments and glass to ensure longer life. Heavy duty heat shielding prevents damaging heat build-up and prolongs the bulb’s life. The “R” in R40 stands for “reflector,” which means the bulb’s reflecting surface helps maximize the direction of the light it emits. Show More Show Less
