716 vs 116 TDC Projectors

[P3D Richard Twichell <73163.3423@xxxxxxxxxxxxxx>]

In a response to a recent query about the difference between the models, 
the following reply was given:


>>Is the difference in power really worthwhile ?

>No.  You can always use 750W bulbs in the 116.  The cooling fan is the 
same

Although I agree the fans are the same, I would consider it risky to use 
750W lamps in a 116.  There are other differences:   Although both machines 
have lamp sockets with identical configurations, the 116 sockets are made 
of bakelite, and the 716 sockets are porcelain.  Furthermore, the 716 
condensers are much more heavily heat-sinked in metal.  To use the 750W 
lamps in a 116 is to risk cracking the condensers and burning out the 
sockets. 
 Having noted that, I must say that, having used both machines side by 
side, I saw very little improvement in illumination from the 750s as 
opposed to the 500s.  Of course this was not a scientific test using all 
new lamps and a foot-lambert meter.  Also, as you may imagine, the power 
demands of such a setup on house wiring are formidable.  

I don't consider the carriers to be interchangeable, although the 716 
carrier will fit the 116 with an adapter.

Dick Twichell


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