EMF: Another Outrage Fizzle?

Posted: September 18, 2018 in General Commentary

There has been a bit of a to-do about EMF emission from LED products on the usual outlets carrying SM punditry.  The alarmist assert that EMF from lighting products is harmful to human health, and the EMF emissions from LED light sources is damaging to the eye.

Some of this may be founded on studies like ‘Electromagnetic Field Radiation and Your Eyes‘, published on the EMF-Health web site, which references ‘Scientists Link Eye Cancer to Mobile Phones‘ and ‘Cell Phone Radiation May Cause Visual Damage‘.  Another expert warning of EMF and electronic devices is Dr. Mercola, who wrote ‘The Real Dangers of Electronic Devices and EMF’s‘. Read the rest of this entry »

Flicker is a persistent and frustrating issue, and has been since the first fluorescent and HID lamps were put in service. Complaints of headache, migraine, feelings of ill health, and eye strain are the most common complaints. For some, flicker at 100Hz (Europe/Asia) or 120Hz (North America) is debilitating. Studies have shown that flicker creates reading errors from rapid eye movement changes under sources flickering at under 200Hz – NCBI The effects of flicker on eye movement control, Energy Focus Presentation ‘Lighting Flicker: Effects of Flicker in the Classroom’, including roadway effects – Lux ‘Street light flicker is a new hazard, says watchdog’, CBC – ‘Calgary seizure sufferer worries flickering LED street light will break down again‘.

I will not go into a great deal of detail here on the effects of flicker on human health or the environment. There are hundreds of articles on this topic, by experts in human Read the rest of this entry »

According to marketers of Twitter, Facebook, LinkedIn, Instagram, et al, social media is the engine of change, the foundation for bringing information and real transformation to the people. With Social Media, we will see the world connected and refreshed through the voices of the previously unheard. Social Media is the new light, the symbol of freedom and ultimate new world order founded on the concrete foundation of the first amendment, the true voice of “the People”. It has enabled revolution and advanced the human cause. It all sounds so… amazing and spectacular, if not completely incredible.

Behind the scenes, social media is actually just a software/app product that generates Read the rest of this entry »

Recently, there has been news hysteria about the availability of 3D printed gun plans, and the implications of such a product being made available to the general public. There are several facts that must be squared away before this “news” story can be effectively Read the rest of this entry »

Follow along, and see if this sounds familiar…

In the process of designing a new light, you begin by collecting manufacturer data sheets. You rifle through the LED data to find lumen output for LEDs and select one with a rated lumen output of 390@700mA, 3000K CCT / 90CRI (test current), and 188 lumens per LED at 350mA (calculated value), @ 3.4 Vf, for 158 lumens per watt. Nice!

You calculate what you need to make the target 1000 output lumens, and design a product around the data and calculations, use 7 LEDs operated at 350mA, to include 30% over the target to compensate for optical losses and temperature per the manufacturer data sheets. Using first article parts to build a prototype, you send it off to the photometric lab, expecting to see results very close to what you calculated. You can live with a minimum of 900 lumens, but hope to see better than 1000, as the data provided by the component providers indicates this should be the case. Read the rest of this entry »

Opening Remarks

Modern human existence, as we all know, is primarily carried out indoors. Exposure to natural light is also highly seasonal, even when we avail ourselves of the opportunity to include it in our regular activities. At most, for many in the northern continents, natural light varies from being too feeble to be of value, great enough to be of value, but with outdoor temperatures too cold or hot to tolerate with regularity necessary for good health, or so highly variable throughout the year, that reliance on it as a natural part of our existence is impossible. Further, as we all age, subtle changes take place over time that are not always noticeable at their early stages, but become more of an issue as the years pass. As a result the light we are exposed to indoors, is the bulk of our photonic existence. Read the rest of this entry »

Before we get into this topic, let’s remember that history is filled to overflowing with cries of lighting technology destroying human health. When the incandescent lamp emerged, the gas light industry flooded the market with baloney about its harmful effects (including claims that electric lights caused women to get the vapors), in support of the healthful glow of gas lighting (gag). Fluorescent and HID technologies have been under attack from their very first introduction. It’s quite funny to see now the defense of HPS by LED detractors, as it has been the target for criticism for decades. My advise for the apoplectic LED detractors… take a very deep breath and get over it. Every light source carries with it a compromise, including daylight, with undesirable effects we must do our best to mitigate. I suggest to anyone interested in the processes of new lighting technology: An interesting read on the 60 years it took to get lighting off the gas. That said… Read the rest of this entry »