This otherwise unremarkable lamp deserves a mention purely for its truly diminutive size if nothing else.  Cheap CFL's with dimensions equal to their equivalent incandescent rivals are unusual.  Generally I have found that such compact products fall far, far short of their claims in terms of output, only those from the big manufacturers such as Philips and GE managing to live up to their claims.  This one however does seem to have pulled it off, not only does it succeed in producing more light than your garden variety 40W incandescent...but it's actually *smaller* than a normal PS60 incandescent lamp!

How this has been achieved is quite clever, in that the designers of this lamp have managed to cram a 4-U style T-8 tube into a base just 50mm in diameter.  This is actually smaller than many spiral designs of the same wattage I have seen.  The use of 4 rather than the usual 2 or 3 sections of tube allows the overall length to be reduced considerably.  Also of note, is that the ballast compartment actually protrudes above the base, some components actually mounted in the area between the tubes.  While good for creating a compact lamp, this may not bode well for the longevity of the lamp, as components in that area will inevitably operate at higher temperatures than present elsewhere.  A compromise however that the designers obviously saw fit to make however.  For lamps to be created so small, measures like this generally have to be made in this country, as the ballast always takes up a certain amount of space - in Japan, more compact lamps can be created due to the mains electricity supply being rated to 100V - making it possible to design very small ballasts.  In this case though, if the lamp managed to last for even 5000 hours, that is still 5 times as long as the incandescent lamp it is indented to replace would have lasted - and during those 5000 hours, it will have saved a considerable amount of energy, as with many cheaper lamps, it is the energy saving that is being sold, not the lifetime.  Hence the fact that the lifetime of this lamp is not indicated anywhere on the lamp body or the packaging.  Certainly one of the more interesting cheap lamps I've found over time anyway.