Changes

==Problems==

==Problems==

*A problem common to many is that compact fluorescent lights (CFLs) are designed to have the tube on top, and the compact ballast below. So, they are designed such that in upright sockets, this is the case.  However, when sockets are sidways, they tend to function for as long before failing, presumably due to overheating.  This problem is much worse with inverted sockets.  When a CFL light is installed in one of these, the tube ends up on the bottom and the ballast on top.  Heat from the tube rises directly into the ballast, and tends to build up there, having few ways to escape.

*A problem common to many is that compact fluorescent lights (CFLs) are designed to have the tube on top, and the compact ballast below. So, they are designed such that in upright sockets, this is the case.  However, when sockets are sidways, they tend to function for as long before failing, presumably due to overheating.  This problem is much worse with inverted sockets.  When a CFL light is installed in one of these, the tube ends up on the bottom and the ballast on top.  Heat from the tube rises directly into the ballast, and tends to build up there, having few ways to escape.

*Since the pule rate (about 120Hz) is well above the speed that the human eye can seem to generally detect (50-60Hz), it seems that there should be no problem with the use of these.  However, there have been notable increases in reports of headaches, eye strain, dizziness, and general eye discomfort in some places when fluorescent lights are installed. High frequency electronic ballasts (which run at a rate of at least 20,000 Hz) seem to significantly reduce these problems, (by up to 50%) but not eliminate them.<ref>Fluorescent lighting, headaches and eye-strain. A. J. Wilkins, I. Nimmo-Smith, I., A. Slater & L. Bedocs. Lighting Research and Technology, 1989. Vol. 21, 11-18</ref><br /> However, some counter these statistics by saying that the pulse rate is simply to great to be noticed.  They say hypothesize that these problems could be caused by radio frequency radiation (or Radio Frequency Interference/RFI) generated by the ballasts.<ref>http://www.scientificamerican.com/article/flickering-fallacy-cfl-bulb-headaches</ref><br />

*Since the pule rate (about 120&nbsp;Hz) is well above the speed that the human eye can seem to generally detect (50–60&nbsp;Hz), it seems that there should be no problem with the use of these.  However, there have been notable increases in reports of headaches, eye strain, dizziness, and general eye discomfort in some places when fluorescent lights are installed. High frequency electronic ballasts (which run at a rate of at least 20,000&nbsp;Hz) seem to significantly reduce these problems, (by up to 50%) but not eliminate them.<ref>Fluorescent lighting, headaches and eye-strain. A. J. Wilkins, I. Nimmo-Smith, I., A. Slater & L. Bedocs. Lighting Research and Technology, 1989. Vol. 21, 11-18</ref><br /> However, some counter these statistics by saying that the pulse rate is simply to great to be noticed.  They say hypothesize that these problems could be caused by radio frequency radiation (or Radio Frequency Interference/RFI) generated by the ballasts.<ref>http://www.scientificamerican.com/article/flickering-fallacy-cfl-bulb-headaches</ref>

*It has been noted that as fluorescent lights age, they tend to produce modulating light emissions.  For example, the U.S. National Library of Medicine did a survey of their own fluorescent lights, and found that 42% of their lights were modulating brightness up to 20% and occasionally even 30%.  In other words, 42% of their lights were fluctuating their brilliance by about 20%.  These fluctuations are noticeable, and can be especially problematic for people with epilepsy,<ref>https://www.ncbi.nlm.nih.gov/pubmed/499117</ref> although they may also cause the headaches, and eye strain others sometimes notice as well.<br />

*It has been noted that as fluorescent lights age, they tend to produce modulating light emissions.  For example, the U.S. National Library of Medicine did a survey of their own fluorescent lights, and found that 42% of their lights were modulating brightness up to 20% and occasionally even 30%.  In other words, 42% of their lights were fluctuating their brilliance by about 20%.  These fluctuations are noticeable, and can be especially problematic for people with epilepsy,<ref>https://www.ncbi.nlm.nih.gov/pubmed/499117</ref> although they may also cause the headaches, and eye strain others sometimes notice as well.

== References ==

== References ==