Page 9 - AquaRay

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Metal Halide
This is also based on mercury vapour. However,
this high pressure, gaseous mixture contains
metal halides to improve the efficacy and
colour rendition of the light.This is also an
energy efficient light source (around 75-100lm/W),
but it is only available with much higher power
consumptions (70-400W). Until LED, this was
the best way to get a large amount of light
over an aquarium and also to achieve a great
shimmer effect due to it being a point light
source. It is, however, very expensive to run
due to the high power needed and the high
cost of replacement lamps.As with fluorescent
lighting it requires a reflector and also creates a
broken spectrum.
In addition
to this, it pumps
out a huge amount of
heat, usually resulting in the need for a chiller to
keep the temperature of the aquarium at the
correct level. Once again there is mains voltage
over the tank and the lamps are made of glass
and ceramic with mercury inside, all of which
are major drawbacks to the technology.
With regards to mounting options, metal
halides are big and heavy and can only really be
suspended from the ceiling or a wall bracket.
They are also not dimmable.
7
TIP
Think about varying
the colour and lighting
levels throughout your
aquarium.This can
create some very
dramatic effects and
give a real sense of
depth.
What types of lighting are available?
May it be a light to you in
dark places, when all other
lights go out
JRR TOLKIEN