Gloucester County Historical Society wrote:
>
> I am director of a museum that's currently being rewired.  I am
> familiar with plastic sleeves put over florescent lights to cut down
> on UV.  How can I filter UV from light coming from incandescent
> lights?  I mean table lamps, track lighting, chandeliers, etc.  There
> is new UV blocking film on the museum's windows, too.  Thanks for your
> advice.

Before investing in filters, have you calculated whether there is an
appreciable UV component to worry about?   For common incandescent
filaments, the UV component is very small, and can be lessened by
running them at lower temperatures (e.g. by using lower voltage
supplies.)  In fact, if you analyse the spectrum of common incandescent
light, you'll find that most of it is invisible and harmless infra-red.
So it might be worth checking whether the filaments in use do in fact
present a problem.

If you have a pre-determined standard threshold for tolerable UV
exposure, then it would probably not be very difficult to calculate a
sufficiently accurate estimate of whether the threshold is exceeded.  A
good student of 2nd-year university physics should be able to do this
with little difficulty, given some spatial data about your museum.

----------------------------------------------------ô¿ô-
Alistair Kwan                                        -
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