Vidi ovo:
Metal halide (MH) lamps do not achieve their full light output
immediately after starting. Rather, they require a period of time-1 to
15 minutes-to reach 90% of their full light output. This period is
called the
warm-up
(or run-up) time.
After a lamp has been on for a period of time and
then extinguished, it cannot be immediately turned back on. Before the
lamp can be turned back on, the arc tube must have a chance to cool down or the lamp will not restart. This period of time is called the restrike time.
Restrike times for traditional probe-start MH lamps can take 15 minutes
or longer, but restrike times for pulse-start MH lamps are generally
much shorter (see Figure 4). According to manufacturers' literature,
restrike times for pulse-start MH lamps can be more than twice as fast
as for probe-start MH lamps.
Ovo podebljano je poenta. Kad nestrane struje i odmah dođe a ova se ne ohladi, struja fila lampu i ona jedva vidljivo svijetli, dakle ne hladi se, nema vremena da se ohladi.