95 kHz Infrared Systems: High Efficiency Fluorescent Lighting (Technical Bulletin MFRM 017A)

Summary

A one-page maker's bulletin warning that high-frequency, high-efficiency fluorescent lighting interferes with all infrared hearing systems on 95 kHz.

Key findings

• States that 95 kHz has historically been the most used frequency for infrared hearing assistance and interpretation installations, and that high-frequency, high-efficiency fluorescent lighting interferes with every 95 kHz system, whatever the brand.
• Advises finding out whether such lighting is installed or planned in a venue where infrared is being considered, and not considering 95 kHz systems if it is.
• Suggests specifying a system that operates on 250 kHz or higher, such as the MHz carriers it names, which it says will operate effectively with high-efficiency lighting.

Limits

A short maker's bulletin without measurements; its list of carriers reads "2.3/2.8/3.3/2.8 MHz", repeating 2.8. It says nothing about LED lighting. Date from the PDF's creation date; the bulletin carries a 2012 copyright.

Read the original

williamsav.com/wp-content/uploads/2020/04/tech_bulletin_95kHz_IR_Systems_and_fluorescent_lighting.pdf

Link checked 9 October 2026. We link to the original and do not host copies.

Cited in

• Where does infrared assistive listening work, and where does it fall short?Partly answered

Cite this source

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