A: This bulb can be used in enclosed fixture. It is a directional bulb so the base swivels to direct the light. It produces 7500 lumens. You may want to try it to ensure it will fit inside your fixture and that it is the appropriate lumens for your application. This product has E26 base with ES39 adaptor so it should fit your fixture regardless of the base. Returns are free if it doesn't work for you.
A: For these bulbs, you must bypass the ballast to install. But it is very easy and worth it to upgrade to safer and more efficient lighting.
A: This OREIN Lamp(s) is warranted to be free from defects in material and workmanship for 3 years.
A: This should work fine it has the adapter for the larger sockets
A: From the description: Ballast must be bypassed if present. The ballast might destroy the bulb due to the very high voltage