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Re: Aquatic Plants Digest V4 #712
Hi Ivo,
The "89" type is probably the Philips īTL`D/89 Aquarelle 10000K that is
widely used in Europe. I use them myself and really like them. They
somewhat compensate for the strong peat tint I have in my tanks. The
10000K rating is a bit confusing since they donīt look that blue to me.
Colour rendition is excellent even though the CRI is only 89.
Lennart
Norrkoping Sweden
Ivo Busko wrote:
> ------------------------------
>
> Date: Mon, 11 Dec 2000 08:30:08 -0500 (EST)
> From: busko at stsci_edu (Ivo Busko)
> Subject: Dutch aquarium lighting
>
> I did a quick survey of the nbat Dutch web site to gather some technical
> data. I am curious about what techniques they use, and if, and how, they
> differ from "our" current lore. I had the impression, when first browsing
> thru the tank descriptions, that there was a high incidence of very low
> color temperature bulbs, at least according to "our" standards. The data
> below confirm this. Note that apart from the "daylight" and Aquarele, there
> is no reference to anything as "blue" as 5,000 Kelvin. Use of incandescent-like
> color temps (around 3,000 K) seems to be the norm instead. There is also
> no references to anything different from standard fluorescents, such as MH,
> PC or halogen (or I just couldn't find them...)
>
> 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.
>
> The table includes all planted tanks listed at the 1999 competition pages,
> and also the planted tanks listed at the archive page under "Vivarium in
> beeld". I didn't include a couple tanks for which I couldn't make sense of
> the light bulb designations (such as 77). I also didn't include a couple
> tanks with incomplete data.
>
> - -Ivo Busko
> Baltimore, MD
>
> Volume Watts/gal Depth Quantity of bulbs and color type
> (gal) (cm)
>
> 100 2.87 50 5 X 29, 830, 840
> 112 2.57 50 3 X 830, 1 X 840, 1 X 89 (?)
> 92 2.50 45 2 X Warm white, 1 X Grolux, 1 X daylight
> 110 2.28 50 82, 830
> 106 2.18 47 1 X 92 (?), 1 X 930, 1 X 940, 1 X 840
> 152 1.90 60 2 X 830, 2 X 840, 1 X Aquarele
> 198 1.75 48 6 X 92 (?)
> 172 1.67 50 8 X 830
> 132 1.62 55 2 X 92 (?), 2 X 940
> 90 1.60 50 1 X 89 (?), 1 X 82, 1 x 830, 1 X 840
> 283 1.52 55 12 X 830, 840
> 124 1.45 60 4 X 830, 1 X 840
> 276 1.42 55 89 (?), 930, 940
> 86 1.26 50 2 x Warm white, 1 X Aquarele
> 146 1.23 50 3 x 830, 1 X 827, 1 X 89 (?)
>
> 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
>
> The (?) means no correspondence exists within the Philips European catalog.
>
> I couldn't figure out what the "89" type means, but there is a reference
> to a "Aqua Star" brand/type associated with that number.
>
>