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Fluorescent lamp dimming adaptor kit

  • US 4,682,083 A
  • Filed: 07/11/1986
  • Issued: 07/21/1987
  • Est. Priority Date: 10/29/1984
  • Status: Expired due to Fees
First Claim
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1. An add-on fluorescent lamp dimming adaptor for connecting to a conventional nondimming ballast in a fluorescent lighting system, said system including a source of ac voltage, said ballast having terminals for connecting to a fluorescent lamp, said adaptor comprising:

  • a switching module adapted to be coupled to said terminals for switching current from said lamp, said switching module being connected in parallel with said lamp so as to divert current from said lamp when said switching module conducts; and

    a level control coupled to said switching module, said level control controlling the conductive state of said switching module to vary the current in said lamp according to a dimming control signal supplied to said level control, said level control causing said switching module to switch at a frequency in the range of 300 hertz and higher during times that said lamp current is being varied.

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