Q 1. What are the ages of the subjects in this study resulting in the recommended level of 250? How are these recommended levels adjusted for different age groups?
Ans. The recommended daytime melanopic-EDI of 250 lux was derived based on data from (and intended to apply to) healthy adults (aged 18 to 55) with regular daytime schedules. It is known that younger and older people respond differently to melanopic light (younger respond more and older less), but so far no different recommended level has been defined for other age groups.
Q 2. Out of curiosity, is the user acceptability already tested for the proposed light conditions?
Ans. Retrieving data. Wait a few seconds and try to cut or copy again.
Q 3. what is a gaussian emitter ?
Ans. With "gaussian emitter" we mean a light source with a spectrum with a gaussian shape. Such a shape is a reasonable approximation of the real spectral shape of an emitter (both direct-emitting semiconductor and LED phosphor)
Q 4. You should use TM-30-15
Ans. As mentioned during the webinar: we use CRI as first spec on colour rendering for Signify products as that is the globally most accepted metric. TM-30-15 metrics are available or can be calculated.
Q 5. Is there a corrected graph for 3000 or 3500K available?
Ans. We have assessed Melanopic-DER vs LER at 4000K and 5000K; lower CCT makes less sense as the melanopic-MDER is inherently lower.
Q 6. When I go to the store, how do I know which light is better for Melanopic-DER? Just look at the kelvin light temperature? CRI? Lumens?
Ans. As we have shown in the webinar, the Melanopic-DER can be quite different at the same CCT or CRI, and since Melanopic-DER is a purely spectral parameter it is not related to lumens. So the only way is to specify Melanopic-DER by itself, as we do for our melanopic light products.
Q 7. What are your suggestions for residential lighting (i.e. table lamps)
Ans. The recommended minimum daytime melanopic-EDI of 250 lux applies to any type of lighting. But be aware: only during the day! Residential lighting will also be used in the evening, then the recommended maximum melanopic-EDI level is only 10 lux.
Q 8. can Signify CES LED tech apply for warmer CCT? like 2700K?
Ans. In priniciple it could be, but we don't have such a product at warm white CCT as the melanopic-DER is inherently low, so it will be very challenging if not impossible to reach the recommended daytime melanopic-EDI of 250 lux.
Q 9. Please can you mention the OEM portfolio for our customers who are looking to make their own luminaires using this technology?
Ans. There will be a webinar on this topic dedicated for OEM in March next year.
Q 10. What do you reacht met a bioup CES luminaire in the same condition
There is a study where the patients stayed shorter at the hospital with better lit spaces.
Ans. If a luminaire with a standard 840 spectrum reaches 125 MEDI lux, then with Signify CES you will reach close to 150 MEDI lux in the same condition (same luminaire, same flux, same light plan). With Signify CED at 5000K you will reach about 160 MEDI lux. The melanopic-EDI should be increased further by optimizing the luminaire and/or the light plan.
Q 11. Why existing lighting standards are silent on HCL?
Ans. Existing lighting standards are generally relatively old, while HCL is a relatively new topic.
Q 12. In North America we are seeing more use of IES TM-30 metrics in place of CRI. Any comment on how BioUp performs under TM-30 for Rf?
Ans. BioUp performs very similar on Rf as a standard CRI 80 LED spectrum does: Rf is around 80.
Q 13. Does it matter if the light to the eye comes from a small or large light source if the amount of the light is the same.
Ans. If the amount of light on the eye is the same and the angle of incidence is ~same, it does not matter for circadian stimulation if the light comes from a small or a large light source. But for other aspects e.g. glare it does of course.