Response Daylight

Daylight has had an enduring influence on architecture, inspiring centuries of designs with nuance and natural rhythms. In turn, people who occupy daylit spaces seem to enjoy the connection it provides to nature, and many report improved health and productivity because of it. Response Daylight by Philips Ledalite finally rights the wrongs of many traditional daylight sensors. Integrated across Ledalite's catalog of high-performance luminaires, Response Daylight is incredibly affordable and seriously simple. 


Designing with daylight controls has never been so simple or affordable. Just add daylight, start saving and enjoy.

Daylight is now emerging as an important design tool in today's climate of conservation. With rising electricity costs and increasingly strict energy codes, sustainable designs that harness daylight to save energy have become a real necessity — for operating budgets and the environment. Daylight controls have a major role to play in this movement. In theory, it should be quite simple: increase daylight, reduce electric light, save energy and save money. In practice, however, the benefits of daylight controls have often been overshadowed by their shortcomings. They're too expensive, they're complicated to specify, a pain to commission, often temperamental in use and sometimes just plain ugly to look at.

Pro-Environment, Pro-Pocketbook

Can provide 30-35% energy savings in window-adjacent locations

Simple to Specify

Completely integrated in luminaire — no power packs, standalone sensors or low-voltage wiring schemes required

A Cinch to Install

Sensors are factory pre-calibrated and ready to use right out of the box — just plug in the fixture

Plays Nice With Others

Sensors adjust light output gradually to natural feeling space with minimal distraction for occupants

Brains and Beauty

Common sense functionality and elegant integration across Ledalite's line of suspended and recessed products

The Best Deal in Town

Available at no charge* in Ledalite's suspended products and for a small charge in recessed products

* NOTE: Offer subject to change.


Pro-Environment, Pro-Pocketbook

Good daylighting designs are obviously good for the planet, exchanging non-renewable energy resources for clean and sustainable daylight. Putting daylight controls to work in your lighting design can also help you reduce operating expenses and comply with tough energy codes. Research indicates that daylight sensors can provide 30-35% energy savings in window-adjacent locations. Beyond improving a building's energy performance, controlled daylighting can also translate into soft-savings gained through the improved health and productivity of occupants.

Simple to Specify

Specifying Response Daylight is almost as simple as specifying any light fixture. There's no need to integrate standalone systems or design complicated low voltage wiring schemes with costly power packs and sensors. Just design the lighting and indicate which fixtures require daylight control — that’s it.

A Cinch to Install

Response Daylight is optimized for typical lighting applications right out of the box — just plug in the fixture. There's no need to rely on third-party installers to calibrate the sensors, or to conduct your own late-night commissioning. The sensors are factory pre-calibrated to provide the light levels you require and to deliver the savings you expect. If your space does require some fine-tuning in the field, Response Daylight sensors are easily adjusted onsite. More About Installation

Brains and Beauty

Ledalite has always appreciated that good design incorporates elements of both function and fashion. No one wants a daylight controls system with unsightly lumps on the ceiling and a mess of additional wiring. That’s why Response Daylight is integrated into Ledalite's luminaires with subtle aesthetics and simple circuitry. All you see is a small, non-obtrusive aperture extending just beyond the housing. Everything that’s required is integrated directly in the luminaire — a total package.


Description Downloads
Response Daylight Controls Brochure Response_Daylight.pdf - 2.84 MB
Response Daylight Design Guide Response_Daylight_design_guide_r2.pdf - 1 MB
Response Daylight Field Guide response_field_guide.pdf - 279.71 KB
Response Daylight Specification Sheet Response_Daylight_spec_sheet_r2.pdf - 72.34 KB
Response Daylight CAD Library - DWG - 10.51 KB
Response Daylight - DXF - 47.38 KB

How It Works

Saving Energy

Lighting is a leading cause of energy consumption in commercial buildings and, as a primary source of heat gain, it also contributes to substantial energy usage for cooling systems.

Using daylight controls in your lighting design offers great potential to save energy. Research varies widely — depending on the design of the building and lighting controls system — but most case studies indicate daylight sensors can provide 30-35% energy savings in window-adjacent locations. Beyond improving a building's power performance, controlled daylighting can also provide soft-savings gained through the improved health and productivity of occupants.

This table shows the average annual savings you can achieve in window-adjacent locations with Response Daylight. Results may vary depending on building location, design, window glazing, etc.

Summer 35-45% 25-35%
Winter 25-35% 15-25%

Response Daylight is designed to save energy by working with people, not against them. If occupants experience too much distraction from changing light levels, they usually disable the sensors - eliminating any potential for energy savings. Sensors have a built-in delay to prevent disruptions from passing clouds and occasional shadows. In addition, Response Daylight applies a weighting to daylight, dimming electric light output gradually on a relative, weighted scale. This creates a more natural-feeling space and, ultimately, happier occupants.








This graphic illustrates how Response Daylight works to reduce luminaire output and save energy.

As daylight contribution increases, the sensor compensates for approximately 50% of additional daylight by dimming the luminaire output on a relative scale. For example, if the sensor is calibrated to 45fc on the horizontal surface and through daylight contribution the total light level increases to 85fc, the sensor will dim the space to 65fc. Dimming will continue until the minimum light output at 1.5V is reached.