used as starting aids for lamps on rapid-start circuits in the past.
ballast starting voltage.
by the metal of the luminaire.
Post by John Gorce Post by Jeff Waymouth
T5 technology employs a "cold spot" design which helps to maintain
proper mercury vapor pressure while operating. This is done by
mounting one electrode deeper within the lamp than the opposite one.
In OSRAM and OSRAM SYLVANIA products, the lamp etch (lable,
designation) is used to indicate the end with the deeper insertion.
While this end is down, convection currents within the lamp keep
that end at its proper temperature where it would overheat if it
were installed etch end up.
do you or anyone else know what a golden strip attached along the
length of the tube would be for?
The lamp is PHILIPS: TL AK 40W/03
L: 61 cm
The golden strip starts at one end cap, and ends at the opposite cap
and runs along the length of the entire tube. It looks like its
attached/etched on the glass.
Something to do with burning position maybe?
I've been wondering about this for some 20+ years now. I don't have
the lamp anymore, so thought maybe someone here knows what it's for.
The lamp's electrical characteristics seem to be identical to a
regular linear 40W fluoro, but I don't know anything about the
burning position because when I got it one of the electrodes was
cut, so I had to jump-start it by shorting it directly.
Post by Jeff Waymouth
Post by TimR
In cases in which the lamps or luminaires are arranged vertically
or at an angle, the lamps must be fitted so that the end with the
type designation (stamp) is located at the bottom (coldest
necessary position for optimum luminous flux at the bottom). With
FC the circular T 5 and vertical arrangement, the lamp cap is to
be located at the bottom.
Why would this be so? In general, will any fluorescent fixture
work mounted vertically? The application I'm thinking of is to
mount one on the wall behind a tall plant.