"Thomas Paterson" <t_p_paterson@[EMAIL PROTECTED]
> wrote in message
news:f9962b5e-2e49-49b9-ab6b-e16639c56ae2@[EMAIL PROTECTED]
> Hi All,
>
> We're doing an adaptor for a fixture to take an alternative lamp. I
> need the standards for PAR diameters and the thicknesses of the rims
> of the PARs, etcetera - the data needed to engineer a retaining ring.
>
> Can anyone help out with where to find such standards?
>
> Regards,
>
> Thomas Paterson
The major manufacturers (at least) do follow ANSI standards; but all
should
also be able to supply dimensioned lamp drawings that show tolerances. GE
used to have a CD-ROM with such stuff. I couldn't find it on line; but it
might be worth a call or e-mail.
However, the main standard is: ANSI C78.21-1995 (PAR and R Shapes),
revised in 2003, and, lucky you, it's available from NEMA as a free pdf
download at: http://www.nema.org/stds/c78-21.cfm#download
Terry McGowan
