A couple interesting thing on this.

In the US, radiated emission limits on unintentional radiators have no
limit below 30MHz. See
http://www.hallikainen.org/FCC/FccRules/2010/15/109/section.pdf .

In the US, electronic ballasts for fluorescent lamps are generally tested
as ISM (Industrial, Scientific, and Medical) devices.

These are also only tested at 30MHz and above. See RF Lighting Devices at
http://www.hallikainen.com/FccRules/2012/18/305/ .

http://www.hallikainen.com/FccRules/2012/18/107/ defines ISM as

(c) Industrial, scientific, and medical (ISM) equipment. Equipment or
   appliances designed to generate and use locally RF energy for
   industrial, scientific, medical, domestic or similar purposes,
   excluding applications in the field of telecommunication. Typical ISM
   applications are the production of physical, biological, or chemical
   effects such as heating, ionization of gases, mechanical vibrations,
   hair removal and acceleration of charged particles.


So, do what you want at 30kHz!

Harold



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