Halogen bulbs in TDC projectors

[P3D Dr. George A. Themelis <fj834@xxxxxxxxxxxxxxxxxxxxx>]

The question of halogen bulbs for the TDC projectors was asked.  As a
matter of fact, there is such thing!  David Hutchison posted the
information back in February.  I saved it and I am going through it now,
ready to pick up the phone and order a few.

Here is the list:

Wattage  Code  Life   LghtOutput  Comments
---------------------------------------------------
500W     CZX   25 h   ?           Classic tungsten
500W     BTL   750 h  11,000      THQ 3050K
500W     BTM   100 h  13,000      THQ 3200K
---------------------------------------------------
750W     DDB   25 h   ?           Classic tungsten
750W     BTN   500 h  17,000      TH 3050K
750W     BTP   200 h  20,000      THQ 3200K
---------------------------------------------------
1000W     ?     ?      ?          Classic tungsten
1000W    BTR   200 h  27,000      THQ 3200K
---------------------------------------------------

THQ stands for Tungsten Halogen Quartz.  I see they are made in two
different temperature ratings.  For projection I would go for the 3200K. 
The halogen bulbs are bit more expensive (about $25 each) but the long
lasting life makes them worth it.  The light output is expressed in lumens
per David's posting (from the Sylvania handbook).

I am ordering both 500W and 750W versions but I will not dare put the 750W
in my 116 with the bakelite holders!  

It you wait, I'll tell you what I find, how the halogen bulbs compare to
the classic tungsten in terms of light output and a good source to get
them.  Heck, if these work well I might buy a quantity to resell together
with the best polarizing filters I can find!

George Themelis


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