How is this extremely user friendly. How can you find your files? It depends on the application service you used?

Doesn't sound very intuitive it sounds a little complicated.

I'm sorry, this is not a very convincing argument.

This is not a statistically significant, rigorous accelerated life test. These are standard use conditions, over a short period of time, taken with a population of 1.

From the anecdotal evidence just in these comments alone, CFL clearly have a very large distribution of failures. Maybe the MTF is accurate but the distribution or log-sigma is very large. I have had 4 fail within weeks and they are used 'appropriately'. I have never had incandescents fail in this way.

Yes I may have cheap bulbs. But they still have a long rated MTTF values listed on the box.

Sure, maybe the ones that do last will survive several million hours. I can say nothing about the MTTF, but clearly there is a very large distribution of failures which suggest very high early-failure rates. You really need to see the failure distribution statistics to determine how they came up with these lifetime numbers.

The blog post does not mention a quantitative, rigorous reliability study. With regards to the topic in question, I don't think it is any more informative than feedback from the random average slashdotter.

I suppose it is interesting nonetheless.

They've proven that standard mirror materials will ablate and burn up very quickly with this laser power. Even rotating the missile does not help. The missile body still heats up significantly.

The laser optics in the airborne laser probably have to be made out of narrow band reflectors which in practice can be made more than 99.999% reflective to a laser. It would be easy to slightly change the laser wavelength and optics (a few nm's perhaps) and the missile would absorb again.

Do you have to include the 'I'???

For decades LEDs have been inorganic and made from semiconductors.

Organic LEDs are the recent exception from the norm.

The reason Cree is so successful is the thermal conductivity of the substrate. Most vendors use sapphire and some do use Si. Look up the difference in thermal conductivity between sapphire, silicon and SiC.
SiC = 370W/mK, Si = 130W/mK, Sapphire=42W/mK

If you can run the LED cooler for the same input power the diode will be more efficient. This is why SiC based LEDs run better and more reliably.

Si substrate GaN LEDs have been around for years they just aren't very good. And it has nothing to do with cracking.

Commercial GaN on Silicon has been available for a years now. The commercial vendors have overcome this cracking problem due to thermal expansion using an AlGaN buffer since about 2005. One problem growing on Silicon is dislocations which limit lifetime, not cracking.

Actually sapphire substrates surprisingly are not that expensive.

I'm not sure why this press release is considered news.

Please remove the Shuji Nakamura tags. Nakamura improved reliability of blue GaN lasers and LEDs. He did not even work on red, yellow, green LEDs which do not use GaN.

Of course. Everything at a finite temperature emits radiation. Even a black hole. We are talking about ionizing radiation.