Electric vs Tar

[StirCrazy]

Ok HQI is one of the most commenlhy misused terms in the hobby but it is used so we will use it.. to answer your question I will defin the real HQI first.

Wattages Bulb Shape Base
70 T-6 Double Ended RSC
70 T-7.5 Single Ended G12
150 T-7 Double Ended RSC
150 T-7.5 Single Ended G12
250 T-9.5 Double Ended FC2
250 T-14.5 Single Ended E40Mogul
400 T-14.5 Single Ended E40Mogul

SYLVANIA HQI® metal halide lamps combine excellent
brightness, long life and high CRI in a compact package
for optimal lamp performance.
The HQI family of metal halide lamps is manufactured with
the addition of rare earth metal halides to improve color
rendering and luminous efficacy. With their compact size
and very short arc discharge length, these lamps come very
close to being a point source of light allowing luminaire
manufacturers to design highly efficient fixtures. The very
high color rendering, white light, compact size, long life and
high efficacy make these lamps ideal for replacing tungsten
halogen in certain retail applications.


so from all that garbage we get that it is a new manufacturing techneque using rare earth metal halide gasses and have a shorter arc length.

because of this they needed the amprage and voltage applied in a different mannor to strike the arch and maintain it properly. also the usage of the Cap on the hqi ballast is to regulate the voltage like an acumalator instad of like a flow restrictor which was a little confusing at first.

Steve