Hi.
My friend give me small bunch of used T12 fluorescent lamps, most of them manufactured by Airam. He said he found them in basement of building where he works. They were cleaning basement and find theese in boiler room. Now do anybody know when theese were manufactured?
Here is a philips made TL 40W/34 Deluxe. You can see small print 5E in bottom right. Is that manufacturing date code? I think this Deluxe color temp is weird. I like more regular collwhite
http://www.lighting-gallery.net/gallery/displayimage.php?album=lastup&cat=0&pos=1Here is one made by Thorn. there were only couple of theese. All others are 40W but theese are 65W
http://www.lighting-gallery.net/gallery/displayimage.php?album=lastup&cat=0&pos=2And lastly some Airam made. I think Airam is not so famous manufacturer in wold. But in here Finland its most famous. I dont know if there is any other Finnish one. So probably you can't me help to date theese one. But they probably are same age as those Thorn/philips lamps.
http://www.lighting-gallery.net/gallery/displayimage.php?album=lastup&cat=0&pos=0