Film-Tech Forum ARCHIVE: Barco DP2K-6E single lamp mode

This is topic Barco DP2K-6E single lamp mode in forum Digital Cinema Forum at Film-Tech Forum ARCHIVE.

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Posted by Steve Guttag (Member # 268) on 05-03-2019, 01:35 AM:

I just put in my first DP2K-6E (in a mixed AV/DCP situation where the projector sits in the room and is replacing the conventional A/V projector so they can gain DCP capability.

So the the projector shows that one can go to single-lamp mode and choose top or bottom lamp but when I try those settings...nothing appears to change.

I have too much light on the screen (over 20fL) and since the S2K machines have miserable contrast, the extra light also gives me extra "greys" instead of a black (is is quite aware that FLAT doesn't fill the imager in width as well as Scope not filling the image in height). The room does not have a conventional screen, let alone masking.

Macro creation does not allow for altering lamp modes either! And why can't these projector companies allow the DCinema projectors with HMI lamps to allow for alternating lamps on each turn on to balance them out rather than just choosing which lamp to use. If it is due to color balance, we can always set up multiple MCGDs and it should be a simple matter to assign the Top MCGD to just when the top lamp is running. Likewise for the bottom.

So did I miss something on the single/dual lamp mode? I've looked through the various manuals and it is not discussed (from what I can find).

Posted by Carsten Kurz (Member # 5396) on 05-03-2019, 02:26 AM:

Hmm. I use dual vs. single regularly, switching modes in communicator. Do you use CLO mode? I use manual/power mode.

- Carsten

Posted by Marco Giustini (Member # 4544) on 05-03-2019, 02:33 AM:

I suspect the reason for the inability of switching lamp mode via macro is that those lamps will take time to switch on and they’ll show green light while warming up so it kind of makes sense to me.
Same for alternating lamps, those lamps will require more colour correction than Xenon and colours will drift with time so switching lamp may give you the wrong colours on screen (not by much, ok, but this is still a DCI machine after all).

Yes, Sony changed the software to allow this on their 500 series projectors. But I see that as a can of worms to be honest.