P3D Halogen projector bulb filament dimensions

[Ralph Johnston/Linda Sherman <copley@xxxxxxxxxxxxxxx>]

I have a digital caliper that does metric and a spare halogen bulb for my
TDC116, so I guess it is up to me to measure its filament.

The Osram BTM 500W bulb filament measures 8x8mm square.

This one came from Dalia.

Regards -Ralph




>
> I am curious about the filament dimensions for the 500W Halogen that
> Dalia sells. Can somebody measure it with a simple metric ruler?
>
> It is curious that I had to speak to factory engineers to get the
> filament dimesions or measure them myself. That data seems to be
> unpublished. It is no wonder that folks ignore that when making
> substitutions. Yet it is just as important as the other data.
>
> Here is data that I got from both GE and Philips for the incandescents
> and just from Philips for the halogens. I measured filament dimensions
> with a mm ruler. All have Medium Prefocus base with filament centered
> 55.5mm from top of base fins. 
>
> ANSI, Type, Elect Power, Light output, Color Temp, Lifetime, Filament
> Dimensions
>
> CZX, Inc, 500W, 12500Lum, 3200K, 25Hrs, 8mm square
> DDB, Inc, 750W, 19500Lum, 3250K, 25Hrs, 10mm square
> BTP, Hal, 750W, 21000Lum, 3200K, 200Hrs, 10mmHoriz X 14mmVert rectangle
> BTN, Hal, 750W, 17600Lum, 3050K, 500Hrs, unknown
> BTL, Hal, 500W, 11000Lum, 3050K, 500Hrs, unknown 
>
> Tom Hubin
> thubin@xxxxxxxxx


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