Philips Infraphil 13373F/479 and 13379F/479 heat lamp
Around 1960 Philips introduced a
completely new type of Infraphil heat lamp
with type number 13379F/479. This lamp
was made from pressed glass, making it
less vulnerable to mechanical damage.
The front of the lamp has a so-called
Fresnel lens, improving the convergence
of the radiation. The pressed glass lamps
with type number 13379F/479 were, like
their blown predecessors, equipped with
a bayonet mount and carry the same
variations of prints on their front.