Fire-Rated to 90 Minutes and Suitable for Solid and I-Joist Ceilings This LED downlight is fire-rated to 90 minutes of protection for solid joist ceilings and ideal for solid and I-joist ceilings . This means the hole you trim to mount your lights is completely resealed, and your ceiling is reinforced to delay the time when the fire will spread. Only a fire-rated downlight can restore the ceiling's fire integrity because its constructed with a built-in intumescent pad that expands when exposed to a specific temperature. This pad then blocks all the small gaps around the downlight, preventing the fire from slipping through and spreading throughout your home. If you want to guarantee the fire protection of your home, this LED downlight can help you ensure that! Works with a GU10 bulb This LED downlight is made with a GU10 lamp holder , so it is suitable with any GU10 LED bulb. However, since its dimmable, using a dimmable GU10 bulb with a compatible dimmer switch will enable you to ac