US 7,321,202 B2 | ||
System and method for reducing flicker of compact gas discharge lamps at low lamp light output level | ||
Venkatesh Chitta, Allentown, Pa. (US) | ||
Assigned to Lutron Electronics Co., Inc., Coopersburg, Pa. (US) | ||
Filed on Apr. 05, 2006, as Appl. No. 11/398,253. | ||
Application 11/398253 is a division of application No. 10/630995, filed on Jul. 30, 2003, granted, now 7,061,191. | ||
Prior Publication US 2006/0197471 A1, Sep. 07, 2006 | ||
Int. Cl. H05B 37/02 (2006.01) |
U.S. Cl. 315—224 [315/307; 315/DIG. 4] | 20 Claims |
1. A method for stably dimming a lamp light output level of a gas discharge lamp to a low lamp light output level without
observable flicker, said method comprising:
receiving a signal indicative of a request to reduce said lamp light output level to said low lamp light output level;
comparing a measured value of a lamp parameter with a threshold value of said lamp parameter; and
in accordance with a result of said comparison,
reducing the lamp light output level to an intermediate lamp light output level and subsequently reducing the lamp light output
level to the low lamp light output level.
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