Metal Halide (MH) and Mercury Vapour (MV):
The lights are HID lights and are used for
the seedling and vegetative growth stages of
your plant. They can also be used for flowering
and are quite good too. They come in all shapes
and sizes and range from 75W - 4000watts. These
lights are very common and are a good kit for
the indoor Cannabis grower.
Mercury Vapour is not as common as it used
to be. It has almost been replaced by Metal
Halide now. If you have a choice between the
two it is best to stay with the new MH kits. MV
also has a tendency to be slightly out of the
optimal spectrum range.
High Pressure Sodium (HPS):
This is the lighting choice of many a
Cannabis Cultivator. These lights come in all
shapes and sizes and have a range of 75watts -
4000watts. These lights are in the perfect
spectrum for growing cannabis and come highly
recommended.
