Hi, PaulLyn.
The lamps which had the "problem" glass were from batches JI, KI and LI. These were manufactured between October and December 2009. All Westron UVB lamps (ReptileUV MegaRays, T-Rex Active UV Heat Flood and Komodo UV-Sun lamps) made with these batch numbers could be affected, but not all lamps from these batches caused problems.
I wrote a summary here:
http://www.uvguide.co.uk/westronrecallspring2010.htm
Lamps from the batch EI were made in the spring of 2009 and were not made in this glass, so they should be perfectly ok. (Obviously, don't forget the basic safety precautions with any mercury vapour lamp and observe the "minimum distance" recommendations very strictly.)
The problem facing people now, with regard to batch numbers, is that many of the JI, KI and LI lamps recalled by ReptileUV have been given the short-wavelength-blocking overspray and should now be safe to use.
So just finding those batch numbers does not necessarily mean a hazardous product.
Lamps made since January 2010 will have a new batch number, I understand from John Wolff that this year's lamps all end with the letter J (instead of I).
I asked Darren Dunnage about the problem reported by a couple of members here, where the new coating has flaked off. He told me they had discovered that this had occurred when they applied this coating over lamps which had already been overcoated with an outer, white magnesium spray coating. (This first treatment was done routinely by Westron, apparently, when they detected lamps with unusually high total UVB output.) The second layer did not bond so well to the glass. Darren says he is not, now, applying the new coating to any recalled lamps that had this first coating.
As for what is happening regarding the other companies (T-Rex, Komodo) I'm afraid I don't have any new information.
T-Rex are selling T-Rex Active UV Heat Flood lamps again here in the UK; I am starting to test two 100W lamps this weekend. These look like the original lamps (PAR38 flood lamps with big brass collars) but there is one big difference - the front glass "car headlight" moulded lens is crystal clear, it doesn't have the milky semi-opaque film inside. This makes the beam very focused indeed, if you hold a piece of paper under it you see a very intense central spot and far less bright areas outside of this. The UVB is in safe wavelengths (no non-terrestrial UVB) but I haven't got any further with the tests than this, so please be patient regarding the meter readings, etc.
(The batch numbers on my samples are CJ )
Frances