Optically efficient CFL
Optically efficient CFL
A new helical (spiral-shaped) CFL from GE Lighting can help designers come up with more efficient CFL reflectors. The helical geometry of the lamp reflects a successful attempt to use space optimally, and has resulted in a shorter overall length compared with other CFLs of equivalent wattage and light output.
The geometry also helps to minimize light trapping and light absorption, GE claims, resulting in a more optically efficient lamp with a very uniform light distribution. The total lumen-per-watt (lpw) ratio is similar to that of other CFLs, but the compact design results in a higher lumen-per-watt vs. overall length ratio than any other CFL. This compact shape and uniform light distribution makes it easier to optimize the optical efficiency of CFL reflectors, especially when designing spotlights.
According to GE, the new lamps will be available in 1996 in two configurations and three wattages:
32W = 2400 lm (75 lpw) 42W = 3200 lm (76 lpw)
The above ratings apply to lamps only-no ballast. An electronically-ballasted screw-based version is rated for 20W = 1200 lm (60 lpw).
Nils Borg