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post #1 of 6 (permalink) Old 02-27-2013, 04:12 AM Thread Starter
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Question Sylvania Gro Lux

Interested in buying a Sylvania Grolux bulb for a T5 HO fixture. I realize without other lighting they can put off a purple hue, I'm ok with that. Just wanted to know if anyone experienced good growth with these bulbs, or am I wasting my time? Thanks.

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post #2 of 6 (permalink) Old 02-27-2013, 11:20 AM
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At one time T12 Grolux bulbs were considered THE bulb for a planted tank. That was about 40 years ago, before anyone really knew anything about planted tanks as we know them today.

The bulbs put out mostly red and blue light, with little in the way of yellows and greens. This keep a lot of plants from doing well. In my opinion it's also a very unnatural looking light.

I'd say don't get them and get the more modern bulbs used today.
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post #3 of 6 (permalink) Old 02-27-2013, 08:45 PM Thread Starter
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Quote:
Originally Posted by DaveK View Post
At one time T12 Grolux bulbs were considered THE bulb for a planted tank. That was about 40 years ago, before anyone really knew anything about planted tanks as we know them today.

The bulbs put out mostly red and blue light, with little in the way of yellows and greens. This keep a lot of plants from doing well. In my opinion it's also a very unnatural looking light.

I'd say don't get them and get the more modern bulbs used today.
I should've mentioned I was looking at the T5 Sylvania Grolux, not the T12, apologies. I thought plants benefited from red and blue spectrum lighting the most? And that they don't absorb green light which is why it is reflected? I've heard its a purple hue and dim, which is why I was going to combine it with a 10,000k daylight also.

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post #4 of 6 (permalink) Old 02-28-2013, 02:17 AM
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I would think the T5 grow lux is the spectrum as the T12. I can't prove it because I've never tried the T5 version.

Yes, they look very purple and dim, but there is a lot of red in there too. Note how they really show off the red colors in fish.

I found that I got poor results under grow lux lighting, even when I used multiple bulbs. Once I replace them with full spectrum bulbs I got much better results.. Granted this was with T12 bulbs and a very long time ago.

I'd say that if you were going to pair it with a 10000K bulb, you'd be fine. At that point your more or less fine tuning the light for what you like. One of the nice things is that the bulbs are not that expensive, so if you don't like it, they are easy enough to replace.
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post #5 of 6 (permalink) Old 02-28-2013, 02:47 AM
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I combine lights like you are asking about.
I use one "Plant and Aquarium" bulb (I do not know who makes it right now...)
and one 'Daylight' or 'cool white' bulb.

The combination makes the tanks and everything in them look pretty natural.
Since most fluorescent bulbs produce fairly narrow peaks of color, using a couple of different ones does provide something closer to a complete spectrum.

Anyway, look up here or at other planted aquarium sites as well as the light manufacturer's site and see if you can get a PAR value for the bulbs. PAR is the measurement of how much of the critical wavelengths that plants need are produced by that bulb. Look in the Lighting forum.
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post #6 of 6 (permalink) Old 02-28-2013, 04:35 AM Thread Starter
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Quote:
Originally Posted by DaveK View Post
I'd say that if you were going to pair it with a 10000K bulb, you'd be fine. At that point your more or less fine tuning the light for what you like. One of the nice things is that the bulbs are not that expensive, so if you don't like it, they are easy enough to replace.
I was planning on using a 10000k bulb as I read they have the most blue light. Not sure if that's true but I think that will be a good combo. I think I'm going to ditch the Grolux as I'm having a hard time finding one anyway. I'll probably just order a magenta or red t5 and call it good. I'm growing medium light plants anyway so I don't need to blast them with a ton of light. Thanks!

Quote:
Originally Posted by Diana View Post
Anyway, look up here or at other planted aquarium sites as well as the light manufacturer's site and see if you can get a PAR value for the bulbs. PAR is the measurement of how much of the critical wavelengths that plants need are produced by that bulb. Look in the Lighting forum.
I've done so much research on various fixtures and bulbs (another site is where I originally found info on the Grolux bulbs) that my head is still spinning Just need to take a step back and plan it out, but I think a 10,000k and a red will do just fine for my setup. Thanks!

“Alive without breath,
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Never thirsty, ever drinking,
All in mail never clinking.”
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