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.
Jeff...
Re: Fluorescent tubes mounted vertically
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.
Jeff...
Re: Fluorescent tubes mounted vertically