So it's time to play 'Lamp Box Tetris' to find it.!

These are nicely made lamps, been tempted to buy one but have resisted so far. Probably because the frosting stops me seeing inside so well.

I like it because a pearl finish on discharge lamps is so rare. The best though is a pearl HPS lamp

I bought quite a few of those when they were available for cheap a while back. I really like them, they produce quite a nice light, and cherry on top, they can be run at lower power (i.e. on a 100 or 70 W MH ballast for the lamp shown here) without turning green. This is a behavior that arises from the distinctive abscence of thalium, a characteristic of daylight MH lamps produced by Iwasaki. The color temperature rises quite a bit however, but the light remains white, which is a nice addition to the increased service life that results from the operation at lower temperature.

Interesting, thanks. I might try running it at a lower power then, the high colour temperature helps with my SAD. Can you help with the date code..? The simple answer would be May 2008 of course but is it that easy..?

Iwasaki's datecode is that simple indeed.

Thanks, Max. It's rare to find a simple system so I wasn't really expecting it..!