Re: TDC Brightness (500 vs 750w.)

[P3D Dr. George A. Themelis <DrT-3d@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Bill D. writes:

>With all this, could you end up drawing too much current than can be 
>supplied, thus limiting the output of the 750 w bulbs?

It is possible...but does not explain the entire picture.  Some 
voltage drop is witnessed when the light output through one lens
is measured with the other lens ON and then OFF.  When the other
bulb is turned off, the light increases by 0.2 EV which shows that
running both bulbs causes some voltage drop, but not significant.

The amps drawn BTW are about 10A for 500W bulbs and 15A for 750W.

I once tried to measure the current drawn during the operation of
the projector.  I emailed the results to Steve and do not have my
notes now... but I remember that the calculated Wattages (amps x
voltage) were significantly lower than expected (1000W+ with 500W
bulbs and 1500W+ with 750W bulbs).  Out of memory I'll say that
it was like 800W for the 500W bulbs and 1200W for the 750W bulbs.
I am not sure if these bulbs consume the rated wattage.  Will 
repeat the experiments when I get a TDC 116 and 716 and two pairs
of bulbs lined up.

George Themelis


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