Sony PCS-1500 Operating Instructions Manual page 136

Videomeeting Room Layout
Lighting Considerations
Do not point the camera towards a window as back lighting
may wash out the contrast. Cover any windows with a thick
curtain.
Adjust room lighting so that it falls on the participants. Avoid
direct light on the TV monitor. Light intensity on faces should
be about 300 lux or more.
If an inverter type or brightness-adjustable type of fluorescent
lamp is used, the sensitivity of the Remote Commander may
deteriorate.
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