Electric-Light
Senior Member
There are many LED brands out there, but Cree on particular really makes some interesting misleading contentious comments. I know they're taking a jab at phosphor coated evacuated glass tube fluorescent lamps when they say "fluorescent" but its funny that they make all these comments since their business almost entirely depend on the same technology them stomp all over. :lol:
?Customers no longer have to accept outdated fluorescent technology as their only choice,? says Cree CEO Chuck Swoboda vie prepared statement, adding, ?There?s no reason to install another linear fluorescent tube again.?
http://www.bizjournals.com/triangle.../cree-says-your-office-will-never-need-a.html
?There [are] a lot of sacrifices we?ve been living with in this fluorescent world,? said Jeff Hungarter, product portfolio manager for Cree Lighting. ?There is a huge opportunity.?
http://www.greentechmedia.com/articles/read/Cree-Takes-on-4B-Fluorescent-Lighting-Market-With-LEDs
I made a diagram and smashed open an LED light bulb so you can see how they work and understand what solid state fluorescent lamp means.
This is how LED light bulbs work.
This is an actual demonstration of white light emitted from the fluorescent phosphor. I used an external blue LED to excite the phosphor on one of the chips inside the LED light bulb I cracked open.
"Despite its
noble premise built from energy policy to
reduce consumption, fluorescent lighting
requires compromise in almost every way: from
flickering and inadequate dimming to mercury
use and poor-quality light." quoting Jeff Hungarter, product portfolio manager with
Cree Inc. as printed on page 32 in July 2014 www.EBMag.com
https://www.creelink.com/exLink.asp?19706952OV78E19I37602548
There's some truth to Jeff's comment and I strongly agree with some of his points. I find poor quality light such as strange distortion, visible chromaticity mismatch between lamps and flickering aggravating too.
High quality electronically ballasted fluorescent lamps using low pressure mercury discharge technology often have less flicker than incandescent lamps. The amount of flicker is dictated by the driver rather than the type of fluorescent lamp. Some lab tested flicker values for some bulbs covered in Lightfair 2012. You can read the full report here: http://apps1.eere.energy.gov/buildings/publications/pdfs/ssl/poplawski_dimming_lightfair2012.pdf
I'm not particularly happy with the excess flicker in one of the solid state fluorescent bulbs meant to replace a 60W bulb. You are probably wondering :? probably because you're not familiar with how LED light bulbs work.
LED light bulbs are predominantly based on pcLED type LEDs which uses the fluorescent technology that some criticizes as outdated. Blue LED chips are smothered and buried in fluorescent phosphor or they're surrounded by walls impregnated with the same. The phosphor makes yellow light and mix with the blue light bleeding through it and makes a white light.
So, this LED solid state fluorescent bulb have flicker and inadequate dimming issues. The bulb is sold as a 60W equivalent and uses 8.5W and makes 800 lumens. I understand that this bulb is getting discontinued and replaced by a newer product that uses 11W to make about the same light. There's a noticeable distortion of moving objects and it especially gives me a headache when I'm using my camera, because it creates a pretty bad rolling shutter effect. Review site agrees with this bulb having a lot of flicker. The review on this LED bulb says the flicker Percent: 44%, Flicker Index: 0.13. I also noticed a visible color difference between the same type products from different batches too. One made in 7th week of 2013 and another in 36th week of 2014 have a visible color difference. I'm not impressed but I'm not disappointed, its a compromise I've come to expect from solid state fluorescent lamp pcLED technology.
Cree's Jeff commented on inadequate dimming with fluorescent lights. That certain pcLED SSFL did not dim anywhere near as well as a pair of F32T8 standard fluorescent lamps on a Lutron Hi-Lume dimming ballast. So he is partially right that some "fluorescent" lights have inadequate dimming, but it's a driver issue.
?Customers no longer have to accept outdated fluorescent technology as their only choice,? says Cree CEO Chuck Swoboda vie prepared statement, adding, ?There?s no reason to install another linear fluorescent tube again.?
http://www.bizjournals.com/triangle.../cree-says-your-office-will-never-need-a.html
?There [are] a lot of sacrifices we?ve been living with in this fluorescent world,? said Jeff Hungarter, product portfolio manager for Cree Lighting. ?There is a huge opportunity.?
http://www.greentechmedia.com/articles/read/Cree-Takes-on-4B-Fluorescent-Lighting-Market-With-LEDs
I made a diagram and smashed open an LED light bulb so you can see how they work and understand what solid state fluorescent lamp means.
This is how LED light bulbs work.
This is an actual demonstration of white light emitted from the fluorescent phosphor. I used an external blue LED to excite the phosphor on one of the chips inside the LED light bulb I cracked open.
"Despite its
noble premise built from energy policy to
reduce consumption, fluorescent lighting
requires compromise in almost every way: from
flickering and inadequate dimming to mercury
use and poor-quality light." quoting Jeff Hungarter, product portfolio manager with
Cree Inc. as printed on page 32 in July 2014 www.EBMag.com
https://www.creelink.com/exLink.asp?19706952OV78E19I37602548
There's some truth to Jeff's comment and I strongly agree with some of his points. I find poor quality light such as strange distortion, visible chromaticity mismatch between lamps and flickering aggravating too.
High quality electronically ballasted fluorescent lamps using low pressure mercury discharge technology often have less flicker than incandescent lamps. The amount of flicker is dictated by the driver rather than the type of fluorescent lamp. Some lab tested flicker values for some bulbs covered in Lightfair 2012. You can read the full report here: http://apps1.eere.energy.gov/buildings/publications/pdfs/ssl/poplawski_dimming_lightfair2012.pdf
- 60W A19 incandescent: 6.6% percent flicker and 0.02 flicker index.
- 60W equivalent CFL #1: 5.1% percent flicker and 0.01 flicker index.
- 60W equivalent CFL #2: 1.8% percent flicker and 0.00 flicker index.
I'm not particularly happy with the excess flicker in one of the solid state fluorescent bulbs meant to replace a 60W bulb. You are probably wondering :? probably because you're not familiar with how LED light bulbs work.
LED light bulbs are predominantly based on pcLED type LEDs which uses the fluorescent technology that some criticizes as outdated. Blue LED chips are smothered and buried in fluorescent phosphor or they're surrounded by walls impregnated with the same. The phosphor makes yellow light and mix with the blue light bleeding through it and makes a white light.
So, this LED solid state fluorescent bulb have flicker and inadequate dimming issues. The bulb is sold as a 60W equivalent and uses 8.5W and makes 800 lumens. I understand that this bulb is getting discontinued and replaced by a newer product that uses 11W to make about the same light. There's a noticeable distortion of moving objects and it especially gives me a headache when I'm using my camera, because it creates a pretty bad rolling shutter effect. Review site agrees with this bulb having a lot of flicker. The review on this LED bulb says the flicker Percent: 44%, Flicker Index: 0.13. I also noticed a visible color difference between the same type products from different batches too. One made in 7th week of 2013 and another in 36th week of 2014 have a visible color difference. I'm not impressed but I'm not disappointed, its a compromise I've come to expect from solid state fluorescent lamp pcLED technology.
Cree's Jeff commented on inadequate dimming with fluorescent lights. That certain pcLED SSFL did not dim anywhere near as well as a pair of F32T8 standard fluorescent lamps on a Lutron Hi-Lume dimming ballast. So he is partially right that some "fluorescent" lights have inadequate dimming, but it's a driver issue.
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