In the interest of general knowledge, can someone talk about the "illumination sphere" or whatever the measuring device is that measures the amount of light emitted from a bulb? Mr. Stern's article on that site is the first time I've heard of such a device, and it's the first time I've seen mention that the blue ring on bulbs such as the Philips Xtreme Power is there to actually REDUCE some of the measured light emitted from the bulb, though in spatial directions that won't matter anyway.
I was under the impression that claims of "more light" from these types of bulbs used a lot of marketing license...that is, there may be 80% more light in one certain area of the beam. They do this by optimizing the size and placement of the filament within the envelope, etc. The light output from the filament itself (meaning the "brightness" I guess) is still within legal limits.
Mr. Stern's article on that website almost reads that the filament really does produce extra-legal levels of light/brightness/whatever the correct term is. And the bulb makers then add a filtering ring to an inconsequential part of the glass envelope to reduce the total light output back into the legal range. Though because this filter is applied to an inconsequential part of the glass envelope, there really may be more light reaching the reflector than one would think if one assumes that all bulbs are simply "1000 lumens + 15%" (or whatever the range is for a particular type).
Could we have a discussion about how the light is measured on these bulbs? I think it'd be beneficial to many...it would certainly be to me.