White level for HDV sequence

I am working on a series of shows shot with HDV (Sony Z1) and destined for broadcast in both HD and PAL networks.
I edit in HD and apply colour correction filters etc to the timeline and monitor the levels using the FCP toolbench levels and "excess luma" option on the canvas window.
So, the luma in HD is declared to be within tolerance - just some green lines indicating whites are OK. But when I convert the finished show to PAL for our UK broadcaster the same footage now regularly goes into illegal white levels - lots of red indicated "excess luma".
Anyone run into this before or seen anything that explains legal levels of HD versus PAL (or NTSC). I guess now that I see the whites declared illegal in PAL I am starting to worry they are to hot for HD as well. I just sent out our first PAL version done this way and just applied a "broadcast safe" filter to the whole timeline but this seems a bit crude.
Any ideas?
Paul Shard
Producer - Distant Shores
Dual 1GHz Mac OS X (10.4.3) 1.75GB ATI9800, FCStudio
Dual 1GHz Mac OS X (10.4.3) 1.75GB ATI9800, FCStudio

how are you doing the conversion? i'm not an
engineer - although i play one at work - so i can't
really speak to what is causing the luma level
shift.
I am exporting the HD sequence as a AIC 1080i50 sequence (it was shot natively in 1080i50) and creating a PAL Uncompressed 8-bit sequence. I put the AIC HD sequence in there and do the 14by9 letterbox there.
is it a global, uniform shift in luma or are you
seeing a luma shift in things like specular
highlights? can you post a screen shot anywhere?
It does seem to be a global increase in Luma. I must do more tests and see if a screen shot is possible.
Right now I'm off to teach a sailing seminar though back tomorrow. Thanks for your suggestions
Paul
Dual 1GHz Mac OS X (10.4.3) 1.75GB ATI9800, FCStudio

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