Thomas James Feiereisen
Engineers at Hampton Cir, Boulder, CO
License number
Colorado 31848
Issued Date
May 9, 1997
Renew Date
Nov 1, 2015
Expiration Date
Oct 31, 2017
Type
Professional Engineer
Address
Address
4191 S Hampton Cir, Boulder, CO 80301
Professional information
Self-Contained Full Light Cut-Off Light Pollution-Free Bulb
US Patent:
2008028, Nov 20, 2008
Filed:
Aug 3, 2007
Appl. No.:
11/890060
Inventors:
Thomas Feiereisen - Boulder CO, US
International Classification:
F21V 11/02
US Classification:
362290
Abstract:
The full light cut-off, light pollution-free, light bulb is a complete and self-contained bulb that is designed to replace standard light bulbs in standard light fixtures turning that standard light fixture into a full cut-off, light pollution-free fixture. The light bulb assembly is built around a light bulb, such as a compact florescent light bulb or a standard incandescent light bulb. Two variations are described. The first design is to replace standard compact florescent light bulbs or incandescent light bulbs mounted in an upward facing socket such as a lamp post or upward socket carriage light fixture. The second design is to replace standard compact florescent light bulbs or incandescent light bulbs mounted in a downward facing socket such as downward socket carriage light fixture. In both designs, the basic light bulb is enclosed in a transparent cylinder. Between the cylinder and the base bulb are a series of opaque, conical louvers arranged so as to provide full cut-off of the light emitted from the bulb in the horizontal direction and above the horizontal direction. Light emission from the bulb will in fact be limited to a cone-shaped volume below the light bulb fixture assembly. The upper end-cap of the cylinder in both designs may be opaque with a mirrored interior surface to aid in reflecting the light in the downward direction. The lower end-cap surface of the cylinder in both designs is transparent to allow maximum possible light transmission in the downward direction.