GE R50 reflectors come with a small edison screw base and are designed to focus the beam of light in one direction, which in turn increases the light intensity.
Upgrade to a greener solution
There are two "green upgrades" for the 40W R50 reflector, the most efficient solution is the 7W Megaman R50 reflector (80% energy savings - 15,000 hour lamp life) but if you do not like fluorescent lighting then we also stock the popular halogen, energy-saving Osram 28W R50 Reflectors (30% energy savings - 2,000 hour lamp life), these lamps are a great entry point to energy saving lamps.