Product Brochure

luminance maps of the room to assess discomfort glare [34]. The last approach is identical to the TLA
measures which are also based on modelling of the human visual system.
For consumer lamps there is currently no glare measure available to quantify glare. Moreover, the
perceived glare of a light bulb will also depend on the application. A naked bulb above the table close to
the observer, and at eye height, will be more glary than the same bulb in a lampshade in the corner of
the room. In general, glare is caused by a combination of high luminance, high contrast, and source size.
Anti-glare measures should at least address one of those causes: lower the luminance, reduce the
contrast, or reduce the source size. In the Philips branded LED lighting portfolio of Signify, lamps with
and without glare control are distinguished. A lamp with glare control contains diffusing materials
and/or a pixelated lace on top of the bulb and is perceived as less glary compared to lamps without any
glare control at same flux and same background adaptation. A good glare measure for bulbs is currently
not available and is a topic of research for the future.
4. Dimming
The dimming feature of LED products is defined as the possibility to change the intensity of the light
according to your own preference. The dimming feature of LED products enables you to create the
perfect ambiance or task lighting in every environment. People want to dim artificial lighting for several
reasons. First, they want the ability to change the ambiance of the environment (dim and cosy, bright
and energizing). Secondly, the dimming feature can provide different flux levels over the day, based on
different activities or dependent on the outdoor light levels. For instance, in the evening you might like
to dim the light levels to reduce the contrast between the dark environment and the LED light, in order
to reduce potential glare. Finally, the dimming feature is used for energy saving.
Poor implementation of the dimming feature can introduce some discomfort or unwanted effects like
visible flicker at deep dimming levels, unsteady transitions, high minimum light levels. These problems
originate from the LED driver circuit, variations in mains voltage amplitude, mains connected loads, and
dimmer interaction. Smart electronics design solves the deep dimming issue that suppresses repetitive
and/or irregular visible variations in light level.
The dimmable products of the Philips branded EyeComfort LED range of Signify provide step wise
dimming in presets (SceneSwitch) or continuously over the whole intensity range.
5. Tunable
Tunable LED lighting can be defined in three categories:
1. Warm dimming: ability to mimic incandescent behavior (e.g. CCT drops from 2700K-2200K while
dimming)
2. Tunable white: ability to change the white tone of a light (e.g. 2700K – 6500K)
3. Tunable color: ability to change the color of the lighting (RGB)
Dimming of an incandescent bulb gives a different light experience than dimming of regular white LED
lights. Due to the technology used, an incandescent spiral becomes less hot during dimming and will
therefore emit more reddish white light (lower color temperature). In contrast, the color of the LED-die