Ceiling light and the quality of light

  • Intensity and Color spectrum (sufficient intensity through the spectrum) make a big difference: An article published by the Canadian Institutes of Health Research gives us an important insight to the significance of light intensity and spectrum to induce Serotonin hormone and Serotonin: The study focused on the effects of light therapy on serotonin transporter binding (5-HTT BPND), an index of 5-HTT levels, in the anterior cingulate and prefrontal cortices(ACC and PFC) of healthy individuals during the fall and winter. Twenty-five per cent of healthy individuals experience seasonal mood changes that affect functioning. 5-HTT BPND has been found to be higher across multiple brain regions in the fall and winter relative to spring and summer, and elevated 5-HTT BPND may lead to extracellular serotonin loss and low mood. We hypothesized that, during the fall and winter, light therapy would reduce 5-HTT BPND in the ACC and PFC, which sample brain regions involved in mood regulation. The results to the study showed that "In winter, light therapy significantly decreased 5-HTT BPND by 12% in the ACC relative to placebo (F1,9 = 18.04, P = 0.002). In the fall, no significant change in 5-HTT BPND was found in any region across conditions".

  • Blue free - most of the led lamps manufacturers would offer Worm White lamps with color temperature of 2,700 Kelvin. Problem is that this color, unless specifically verified by the manufacturer, is not blue free!. An article published by the Canadian Institutes of Health Research "Protecting the Melatonin Rhythm through Circadian Healthy Light Exposure" provides us with some more insight into the impact Blue Light have on our Circadian wellbeing: "As a result, our homes and work places are currently illuminated and we no longer have nights of complete darkness. In fact, 2/3 of the population in the European Union regularly experience nights where the sky is brighter than under a full moon [4]. Moreover, since the 1960s, artificial lighting has tended to use increasingly higher intensity discharge lamps, which mainly consist of blue wavelengths [5,6] that affect the circadian system to a greater extent than any other. While daytime outdoor illuminance normally ranges from 2000 to 100,000 lux, indoor office lighting is usually significantly lower, with values around 500 lux [7]. Thus, humans have altered the natural light-dark cycle contrast, which may have serious pathophysiological repercussions [8]".

  • Lamp temperature color range - There are only a handful of vendors that offer a color control range between 2,000 Kelvin to 6,700 Kelvin. There is no reason to compromise for less, something in the range of 2,700 to 6,500 Kelvin is not enough to cover for the issues as mentioned above.

  • Warm White and RGB (Red, Green and Blue) color selection and smart app color control - Today, the price difference between a ceiling lamp with this color selection versus a single color white color lamp is relatively minor, but the benefits of the "multi-color" smart lamp to our wellbeing is to many - an outstanding one. Without getting into the details of all the options that open up with the music visualization capability, its enough to mention the impact that a green light has when fully activated to relieve pain (provided that it has sufficient intensity), as described in the scientific article "For pain, Green Light Means Stop” by Stephani Sutherland on 6 Mar 2017


We recite these articles because of their significant implications on what we call quality of light and its impact on our wellbeing!

Further issues to be observed  

  1. Area Light distribution (homogeneous) - Make sure the lamp illuminates homogeneously, ceiling included!

  2. Dimming range: Make sure it is from 0% to 100%, not being able to dim below 10% is a big compromise!

  3. Music visualization and ability to share “scenes” – this is a big item to be discussed in __________

  4. Review and validate the app friendliness and connectivity to your home comm hub


  • Other considerations in the selection process:

  1. Price (including shipment)

  2. Warranty and life span

  3. Ease of installation