Can anyone please point me to a Web site or study available online that
discusses the actual radio frequencies that halogen lamps (particularly
120 Volt spotlights) emit. This is not about RFI in general but
specifically what frequency range is the RFI! Also, do you know if the
same information is availablefor sodium street lamps as well.
On 11/6/06 6:41 AM, in article
" snipped-for-privacy@emarket> Hi,
If you are talking about incandescent tungsten-halogen lamps, there would be
no significant RFI. Are you talking about some kind of discharge lamp
through a halogen arc?
-- Fermez le Bush
| Can anyone please point me to a Web site or study available online that
| discusses the actual radio frequencies that halogen lamps (particularly
| 120 Volt spotlights) emit. This is not about RFI in general but
| specifically what frequency range is the RFI! Also, do you know if the
| same information is availablefor sodium street lamps as well.
Halogen lamps emit whatever frequency they are operated at. Usually they
are operated at 50 or 60 Hz, often at a lower voltage like 12 volts so
they can use a thicker filament that can burn hotter. These are just a
special form of incandencent bulb designed to burn hotter and be a bit
Sodium street lamps generally also operate at 50 or 60 Hz. But they do
need a ballast to regulate the current flow, and new electronic ones can
do this with variable pulse width timing at some high frequency. The
exact frequency varies. Some work at the AC frequency much like a
common dimmer. Some work at a much higher frequency. Some "chop" up
the AC and others convert to DC then "chop" that (hopefully alternating
if the bulb technology would be adversely affected by DC). To avoid
annoying acoustics, those that operate above the power line frequency
will generally operate above the hearing level, 20 kHz to 50 kHz.
somebody knows if a plasma globe can be lit from a fluorescent lamp
ballast, or an electronic ballast of the type used in compact fluo.
bulbs. I think frequency 20 kHz is OK. but I don't know about the
Thank you, I have researched more now to know it would have never
worked, because those ballasts give only high freq not high voltage. So
I should use flyback. But, I may avoid the flyback driver and the 12
volt transformer by supplying the 20 kHz from an electronic comp. fluo.
lamp ballast and reducing the voltage in some way I don't know.
Would this work?