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Hi, does anyone know what the "k" rating is on the Sylvania Gro-lux lighting tubes. When its switched on it gives off a pink glow.

I cant seem to find this information on the packaging or the tube itself.

Thanks for any info you can pass on.

Cheers
Crusha

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Those who say they cant, Never will !!!

Here's a link to a site that gives the ratings of various Sylvania lighting fixtures, however it doesn't appear to list the k rating for the gro-lux tubes. There is a link to e-mail them, so maybe you can inquire directly for your particular tube.

http://sylvania.aquanet.de/English/dframset.htm

Jim

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Water, taken in moderation, cannot hurt anybody. -- Mark Twain

Thank you for that link OldTimer, much appreciated.

Cheers
Crusha

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Those who say they cant, Never will !!!

If i remember correctly, they're somewhere in the 2800k range. Not all that great, really.

Yea I agree with you Fallout, I just upgraded my lighting and WOW, what a difference good lighting makes.

I was just interested because they are specific for plant growth (according to the tube wrapping) and from what I have learnt you need at least 6500k for plants.

Thanks for your response.

Cheers
Crusha

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Those who say they cant, Never will !!!

Hi,
Growlux bulbs are in the lower, red end of the spectrum
and as you saw, they give off light with a pinkish tinge.
Plants use the light in the red and blue ends of the
spectrum. However, light in those portions tends to
change how we see things, pinkish or bluish light tends
to wash out colors. So, most of us use bulbs in the
6700-8800K range. If you are going to use a growlux
bulb, first be sure it is meant for aquatic and not
terrestrial use, and second, use two bulbs, one growlux
and the other one that is labeled DAYLIGHT or SUNLIGHT.
The plants will then get lots of light, and you will not
see the pinkish tinge as much. Same way with bulbs at
the other end of the spectrum 10,000K+. Most who use
bulbs at that end of the spectrum run a mix of high K
and mid K rating bulbs to get rid of the bluish tinge.
Frank


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Hi Frank,

Thanks for that information, I emailed Sylvania and they replied saying that the Gro-Lux was a 6,500. I purchased another tube of that "k" rating it was much, much brighter. I currently have 1 x 10,000 daylight and 1 x 6500. Tank looks much, much better.

Just waiting to see what effect it has on my plants now.

Cheers
Denise

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Those who say they cant, Never will !!!