IRES® - InfraRed Eliminating System
Technical Note
The big deal about infrared - negative effect on control accuracy.
Silicon phototransistors sense and respond to both visible and infrared light across a spectral range, but can not differentiate between the two.
The presence of infrared (from any source) at the phototransistor has the negative effect of causing the phototransistor to respond to more than just visible light. The resulting false light level reading causes the photocontrol to respond inaccurately.
The higher the ratio of infrared to visible light, the greater the error in control accuracy.
How about Infrared Filters?
Most photocontrols use an optical plastic filter behind the window to filter out infrared, but they only filter the infrared component of light coming through the sensor window.
Optical plastic filters do not filter the potentially substantial amounts of infrared coming through the photocontrol cover, or the infrared emanating from the photocontrol's own internal electronics, or the infrared coming from the luminaire itself.
Over time, Ultraviolet (UV) Light fades and/or deteriorates the filter causing inadequate accuracy.
Solution - Ripley's IRES® InfraRed Eliminating System
IRES electronically cancels/eliminates the photocontrol's reaction to all infrared from all internal and external sources.
