These dimmable 12 watt LED PAR30 Joyous Light® spotlight bulbs with 5500K color temperature and a CRI of 93+ illuminate your home with bright white light, resembling daylight on a sunny day, midday. The bright white light output is ideal for reading and illuminating workspaces at a 30-degree angle and other areas that require visual accuracy and true rendering of colors; in addition, the daylight resemblance can help minimize the effects of seasonal affective disorder S.A.D. or Winter Blues. The PAR30 shape with a medium base is ideal for ceiling light fixtures, track lights and reading lamps. This dimmable LED bulb might not properly dim with incandescent dimmer switches; we recommend installing an LED dimmer switch. The long bulb life of about 25,000 hours and the low energy consumption will save you money in the long run, see lighting facts. All ALZO LED bulbs carry a 1-year warranty and are mercury-free, flicker-free and they generate very little heat. However, ALZO LED bulbs require ventilation; when LED bulbs are installed in fixtures that lack adequate ventilation, the life of the bulb will be reduced. Dimensions: Length: 3 6/8 inches; diameter: 2 11/16 inches.