RE: Aquatic Plants Digest V2 #320
Could some of you take a look inside those parabolic reflectors and see
kind of bulbs are actually installed? I have a really BIG curiosity bump
about this. Are there some true ARC bulbs out there for growing plants?
Brand names and such would sure help. One cannot rely on advertisements to
be accurate. A wide disparity between the facts as known by the
Section and the Ad from the Advertising Department is not at all uncommon!
For your interest:
There is a brand new bulb that has just turned the lighting world
upsidedown, called the fusion
lamp. It has no metal parts in the lamp at all! It is all glass and looks
like a lollypop with a
glass sphere on a glass rod. The sphere is about the size of a golf ball.
Now for the really stunning part, its output efficiency is 135 lumens per
watt! As a comparison,
standard filament lamps are in the order of 10-15 lpw, standard flouros
30-40 lpw, VHO flouros,
50-60 lpw, metal halides 60-70 lpw, low pressure sodium and metal vapour
70-80 lpw and high
pressure sodium 80-90 lpw.
So how does it work? The lamp is filled with a mixture of sulphur and argon
gases. It is driven by a magnetron, so that the microwave energy excites
the gas. The output is in the order of 4500k, with
a CRI index of 79 and is described as daylight (although I would not really
agree). The spectral
distribution is pretty broad, but has a yellow peak, red and blue
components are quite substantial,
with output falling off rapidly outside the visable spectrum.
Apparently, its being trialed on growing roses. The main aim of the lamp
though is for use in stadium
lighting, factories etc. The actual output of the lamp is 135000 lumens,
with a power consumption
of 1killowatt. In Aussie dollars it comes in at approx AU$3000, and is
manufactured by a US
company by the name of Fusion Lighting Inc.
Marque Crozman APD - ANGFA(NSW)