[9eor9]

I've tried it with meanwhile I think 5 bulbs up to 70W. It just works!
The sandpaper (P600) surely does not weaken the glass, the scratches are nearly not even visible. I came to this method, after I had treated the first bulb. With this one I needed to apply the etching cream maybe 6-8 times, until the result was acceptable.
I assume that the surface of the glass is different from the rest. Maybe it is harder or some chemicals are enriched in this area. After scratching with the P600 paper etching worked by far better.

Sandblasting is (now) not my favorite any more. As the glass is truly very thin, it is really difficult not to destroy or damage the bulb.

EU means that frosted bulbs waste more electricity than clear bulbs. Step by step they ban bulbs with lower and lower power consumption. Last year it killed the 60Ws. All frosted ones are banned since 2009 except some types for special applications like ovenlamps or shockproof versions for industrial use.

Energy saving lamps are efficient, but their light is ugly.........., maybe there is some hope for a good development. Recently I found on eBay a bright LED-lamp with a remote control which could adjust the colour temperature between 2800 and 6000K. We'll see.