Pictured above are two reflector lamps made by the Bernstein Company of Boston, Massachusetts. The agent for the lamps was the Western Electrical Supply Company of St. Louis, Missouri¹.

"The lamp has a complete metal reflector entirely within the bulb and situated behind a multi-coiled carbon filament in such a manner as to utilize all of the reflecting surface. The lamps are made with three different types of reflector; a concave form concentrating the light, a convex form dispersing it, and a side reflector for show-window use. Unlike the lamps which are silvered on the outside, the reflector of the 'Lowatt' covers the entire center, making a more efficient reflector. It is also claimed that the 'Lowatt' lamp with a concave reflector shows a candle-power, measured through the tip, of from four to eight times its rated horizontal candle-power."

Reference
1) "Reflector Incandescent Lamp," American Electrician, Vol 13, No 7, Jul 1901, pg 373.