Dental Public Health
Dental Public Health Journal Club Harvard School of Dental Medicine
9 February 2021.
1. From Research to Policy
2. Empowered Movement (Demand & Supply)
3. Relevance to COVID19 pandemic
4. Future Direction Global Oral Health Interest Group (GOHIG)
Video was prepared by Dr Irene Adyatmaka.
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In this video, we explain
In this video, we explain the logic behind why LED Corn lights NEVER work optimally in any setting. The output of a 150w LED Corn light reaching the floor is usually ....? Click on 'Show More' for details (...)
The output of a 150w LED Corn light reaching the floor is usually 20-40% of the lux levels provided by a dedicated 150w LED High Bay with all the LED chips directed towards the floor.
So any saving made on the installation will be countered by reduced productivity and Health & Safety issues.
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? In this video you will watch why or why not to use corn light bulbs.
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Hello, Mr. Lauritzen. I want to comment on your statement that corn cob light bulbs are inefficient to use in your hausehold. At some point you might be right that design of these corn cob light bulbs are not ideal for general use in most houses. According to my observations they would not be used like a traditional ceiling bulb but more for photography and/or videography purposes and most of the time, inside of a softbox. From my own experience with corn cob light bulbs, I would not say that they are useless. I use them in my softbox for photography or video works and I can only say how convenient they are. I also do not agree with your statement that you get only 25% light from the bulb because only a small portion of the bulb will be pointed towards the floor. First, if you ever heard about "photons", they do not travel on a straight line in the spaces, especially in a room. These photons bounce of the ceiling and walls, though they come from a sort of direct light source. If we consider that most of the people's houses are with white ceiling, reflection and therewith the light spill will be increased. Second, you compare the corn cob light bulbs with traditional light bulbs, which should not supposed to be used in a same way. Your argument is more like to say, "don't use truck wheels on your car, just use X company car wheels". Lastly, I would suggest you not to forget to mention the addressees on the title of your video to make sure WHO should "never use corn light bulbs".
The flaw in your logic is that the original light bulbs , Albeit MH or HPS ot LPS or even the old standard Mercury Vapor bulbs also had at least 50% of the light going in a direction that it was not needed . All of this said comes back to the quality of the fixture its self . The important thing is the reflectors. This is what directs the "SPILL LIGHT" back to a usable direction . . Better yet is a light fixture that has a true Mirror reflector . All of this said , A LED light where all of the emitters are exactly directed the way you would like them is in truth impractical to have for all applications but Yes it is the most effective way to get every possible lumen out of a light source. With the multitude of applications out there one must make informed choices.
Nothing like a bias support, lol he sales metal hylide bulbs
Love the welsh accent
Was given one of these (looks just like the one in this video 150w) I was wondering if I can screw them into my outside flood light receptacle, its the standard two fllod light outlet you can buy for $30 bicks at Lowe's. I'm concerned that it might get to hot for the fllod light fixture its screwed into outside?
There is considerable
There is considerable evidence that LED lighting poses some potential health detriments, especially to eye health and the prevention of macular degeneration.
Incandescent bulbs give off light near the infrared end of the spectrum and this aids in repair and recovery of tissues, while the LED bulbs give off blue light which as been found to cause degradation and ROS of the tissues.
Avoiding LED lights is less of an issue in a sun filled room but much more important after sunset as blue light before bed decreases melatonin production.
Watch the full interview of Dr. Wunsch here:
What about different colored LED bulbs such as red or orange, is that actually red and orange and a safe solution?
Why do dim, yellow flouresent lights cause deppression?
What about red light from an LED?
What kind of light is best for growing Mary Jane plants or should I refer to medical or Nurse Mary Jane plants?