the Grandiosa model 54 was equipped with coloured screen filters
Grandiosa model 54
An incandescent lamp consisted of a metal wire in a
glass bulb without oxygen. An electric current heated
the metal wire and made it glow white-hot while the
lack of oxygen prevented the wire from burning. The
main application for incandescent lamps was lighting
but, relative to the amount of light they produced,
incandescent lamps produced an even greater
amount of infrared radiation. This is why many
infrared radiators for therapeutic applications were
based on the principal of an incandescent lamp. For
straight light therapies incandescent lamps were not
very efficient unless the excess of heat could be
expelled easily like in hand-held devices for local
treatment. Incandescent lamps made of coloured
glass or equipped with coloured screen filters as
with the Grandiosa model 54 on display here, were
used for colour therapies.