I guess maybe improvements might be a better term.
To be honest from talking to the reps absolutely zero has been done to the ipv 35 and 50 watt since they were released . They are exactly the same if you bought one now or when first released .
There have been very very few complaints so i guess thats why, they started working like crazy on other ones so i guess their efforts are being utilized elsewhere.
Thanks, herb!
Anytime KD.