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RE: Dutch aquarium lighting

> Date: Mon, 11 Dec 2000 08:30:08 -0500 (EST)
> From: busko at stsci_edu (Ivo Busko)

> The Watts/gal values seem rather low but are consistent with 
> the distribution 
> posted by Erik Olson at the krib site, albeit at the lower end of the
> envelope. These are in general quite large tanks.
I belive that few aquarium people in Europe have more than 1-2 W/gal. Most
would think that only Americans would use more than 3 W/gal :-)

> Color designations:
> 29  -  2,900 Kelvin, CRI 70 (halophosphor)
> 82  -  Perhaps a shorthand for 827 ?
> 827 -  2,750 Kelvin, CRI > 80 
> 830 -  3,000 Kelvin, CRI > 80
> 840 -  4,000 Kelvin, CRI > 80
> 92  -  Perhaps a 2,750 Kelvin, CRI > 90 ? 
> 930 -  3,000 Kelvin, CRI > 90
> 940 -  4,000 Kelvin, CRI > 90 
It is common to leave out the last digit in the designation, so 94=94x and
82=82x. These designation are commonly used for both Philips and Osram tubes
in Europe. As you can see, first digit designates CRI and the second digit
designates color temp. Tropica and others recommends 94 tubes.
I talked to Philips in Denmark about availability of different lamps in
Scandinavia. They told me that the choice of color temp. is largely a
cultural thing. In the northern part of Europe mostly lamps in the 2000-3000
range is used, and in the southern part colder lamps are usually used. This
is of course general use, but I would guess it also influences the choices
of lamps for aquariums. If nothing else, then because colder lamps can be
different or impossible to get in all lengths in northern Europe (although I
would guess that all Philips lamps are available in Holland).