Available in 4 and 6 inch apertures, the Philips Lightolier CorePro LED Downlight is perfect for both retrofit applications and new construction projects. Approved for use in both IC and Non-IC installations, these luminaires can improve the lighting in any number of spaces including living areas, kitchens, home offices, hallways, bedrooms, and other common areas. Installation is a charm and takes less than one minute. The Philips Lightolier CorePro LED Downlight simply utilizes a screw cap similar to that of an incandescent lamp and fits perfectly into a medium base lampholder found inside the downlight. Stainless steel friction springs on the Philips CorePro LED Downlight allow for a snug fit inside compatible downlights once installed.