Thanks4OP. Pretty much confirms what I suspect every time I see "4 watts" -- common sense will tell you it'll be as or probably less bright than one of those cheap 3 x AA "3 watt" headlamps with no-name emitters. Any decent LED bulb will need to be, what, 10 watts min, pref 17+.
DX has some interesting high-wattage large-surface bare LED's, like 20+ watts. They seem easy enough to hook to a computer heat sink and power with a regular DC power supply. However I've not seen anyone do that, just people torture-testing Cree's is as close as I see on that. No idea why we don't see these at market as a finished product? Even in wal-mart now I see these 4-watt pieces of shame. That's not acting in good faith in my opinion, as 4 watts by any means is not going to be much more than a night-light.
I think maybe we see Match's next project? The [multi?] XM-L "X-Lamp Lamp'? Seriously, how much would a well-made single Cree XM-L semi-directional/lower output light bulb really cost? I think going from AC to DC would be the hardest part, even beyond heatsinking? An XM-L die wholesale costs maybe, what--$5 wholesale or less? KD has 'em on a star for $8 shipped.
At this point the demand is so high and supply so low, yet bare parts available, I think someone could make at least decent side money cobbling such things together by hand, possibly a living like Nailbende, selling them on Ebay, shows/conventions, FORUMS, etc..
Some of the "higher" wattage ones at Wal-Mart (like 8? LOL) seem to have fans in them! I'm not sure, it's hard to tell. But I am NOT going to buy a bulb which makes noise of its own! Which is why I won't buy CFL--not (necessarily) audible noise (that too, sometimes), but they produce just TONS of electromagnetic garbage/noise. In fact that's how they produce the light in the first place. Put a handheld AM radio up near a CF bulb when they're both on and you'll hear the sound of death.
I'm really hoping that CF will be the "Windows Vista" of lighting technology: touted as the greatest next technology, horrible but some will love it just because it's supposedly great, only around for a short time, and in the end, not a replacement for the older technology... Replaced by something less bad, yet not a complete replacement solution for the old technology. LED will probably be the "Windows 7" of light: what CFL was always supposed to be but never was, still bloated (LED's are ridiculous expensive on the front end compared to incan), not great (LED's have a hard time producing the riciculous light an incan can), but not the bad dream the last "leapfrog" technology was. CFL's will hopefully be analagous to the zeppelins of the past: not the first flying technology, and replaced by simply better versions of a previously-developed technology.
So much energy and resources go into CFL's, some argue that they are not a net energy saver over their lifetime. Esp if they break a lot sooner than advertised, which is my own experience. That's why they cost so much: much more energy and environmental cost goes into producing them, vs incan's which are very lean on resources used. Same reason hybrids cost more than a comparable vehicle. To save $5 to $15 on electricity, that bulb will need to be used a lot, and last a long time.
Plus, CFL's can be very dangerous, and fail catastrophically at unpredictable moments. Had it happen to me, and have read worse stories of them breaking unexpectedly and spewing fiery plasma until turned off (not to mention the mercury). Just 1 whole-room carpet replacement for spilled mercury covers enough resources for a lot of incan light bulbs and electricity to power them for a LONG time. I now won't leave the home with a CFL running.
Personally, I'm stocking up on 100-watt incandescent light bulbs (30 cents apiece!) as in the USA, national socialists are trying to ban them. If nothing replaces CFL, I'll have to be a renegade and get DX to try to sneak my contraband incans past customs. Maybe I'll be arrested on a streetcorner trying to buy 100 grams of incandescents, or get my car towed when they find a few during another surrepetitious search. A woman can 'choose' to have an abhortion [sic] on demand and kll her own healthy, consensually-generated human offspring, but it's not our 'right' to 'choose' which light bulb we use? Wake up, this is the wisdom and ethics of Leftism.
From the looks of this Comparison, it unfortunately looks like LED replacement for incans is quite aways away.