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Old 12-26-2016, 05:12 PM   #1
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New Light Good or Bad?

Hello everyone, hows it going... good.... so I needed a new light for my aquarium to get better plant growth, I used to have an aqueon full spectrum 17 whatt 8000K t8 light and now went out and bought an aqua glo 20 watt 18000K t8 light and am wondering if its good? I will attach pictures and just want some feed back of how great this bulb really is... and if anyone has had experience with them... thanks

UPDATE: The aqueon made the tank look much brighter... the new light I bought makes the tank look dimmer..yet more red/pinkish...
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Old 12-26-2016, 06:02 PM   #2
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18k is pretty bright...Like marine bright.
I can't say for sure but I really need to limit my time and keep good distance with my 10k leds....
You can always get another bulb if it doesn't work?
Most plant people say they like 6500 I think....
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Old 12-26-2016, 06:32 PM   #3
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Hello, Its rated for a freshwater aquarium and it says its good for freshwater plants, it also seems dimmer than the light i had (aqueon) and much more red/pinkish...
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Old 12-26-2016, 07:42 PM   #4
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New Light Good or Bad?

Quote:
Originally Posted by russianaquarium View Post
Hello, Its rated for a freshwater aquarium and it says its good for freshwater plants, it also seems dimmer than the light i had (aqueon) and much more red/pinkish...

U can grow plants under t8's but for the best results u want a t5 6500k
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Old 12-26-2016, 08:09 PM   #5
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Will it grow plants? Or should I return it and buy an Aqueon Plant Growth bulb?
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Old 12-27-2016, 03:20 AM   #6
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Will it grow plants? Or should I return it and buy an Aqueon Plant Growth bulb?

Plant grow one would be a lot better to be honest
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Old 12-27-2016, 03:22 AM   #7
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All lights will grow plants whether it's mainly red, blue, yellow, 6500k, 18000k.

The amount of photons the bulbs emits per second per meter squared and the distance from the bulb to the plants plays the biggest role in terms of growth. Less photons and further away the slower the plant will grow or more chance of the plant not growing at all. The more photons emitted and the closer to the bulb the faster plants will grow and the more nutrition they will need.

If you don't know the number of photons the bulb emits every second over a meter squared (PAR rating) then you can only just try it and see. The type of plants you use may determine your success too.
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Old 12-27-2016, 03:26 AM   #8
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All lights will grow plants whether it's mainly red, blue, yellow, 6500k, 18000k.

The amount of photons the bulbs emits per second per meter squared and the distance from the bulb to the plants plays the biggest role in terms of growth. Less photons and further away the slower the plant will grow or more chance of the plant not growing at all. The more photons emitted and the closer to the bulb the faster plants will grow and the more nutrition they will need.

If you don't know the number of photons the bulb emits every second over a meter squared (PAR rating) then you can only just try it and see. The type of plants you use may determine your success too.

Isn't the 6500k the temp of the colour that's best for plants to absorb though? God light can be so confusing. Isn't that why t5 is better than t8 for plants? Because the plants absorb the light better?
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Old 12-27-2016, 10:28 AM   #9
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Isn't the 6500k the temp of the colour that's best for plants to absorb though? God light can be so confusing. Isn't that why t5 is better than t8 for plants? Because the plants absorb the light better?

Light can be confusing. That's want the manufacturers and developers want. That's why they like to add labels and tag lines to their boxes that can trigger people in to buying their bulb over someone else's.

Sometimes you get a fancy graph or a CRI value as well as Kelvins, watts, sometimes PAR now it's clear we are moving more in that direction. Even with a PAR value at hand what can we really do with that? With 100s of different species of plants available to us we are never going to get a perfect PAR value. All tanks are different.

Kelvin is colour temperature which Essentially means the colour of black body that has been heated to varying temperature values. You might notice that a flame goes orange, red then blue then white the hotter it gets. This is why blue colour lights are often in the higher kelvin ratings.

The fact is that the bulbs we use have all the colours the plants need to grow healthily. Whether you use a 10,000k or 6500k. You can manufacture varying 6500k bulbs with a different colour mixes.

6500k also happens to be the colour temperature of the sun which makes people feel better I think.

ADA used bulbs high in the green spectrum for aesthetics but grew plants fine.

6500k tends to have a nice warm colour that looks more pleasing to the human eye when it comes to aquascaping.

As long as we are using bulbs that give out wavelengths in the 400-700nm range then the plants will use that light.

Perhaps certain plant allocation and morphology relies on certain colours but whether we use an osram fluorescent from the local hardware store or a bulb marketed towards growing plants they will both do that job well. The bulb marketed towards growing plants may reflect more colour that we find more appealing whereas the shop light may appear more yellow.

This is why I don't get too hung up on light. Keep it simple. Keep it generic. Better to test for ourselves. I've used all kinds of tubes and have had good success at growing both algae and plants. Just my two cents
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Old 12-27-2016, 10:49 AM   #10
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Hello, thanks for all your replies... I will attach a pic of the chart that was on the box. As you can see it has a spike in the blue, and 2 spikes in the red.. what does that mean, will it grow my plants... and im thinking of keeping it for now... because it says its suppose to grow plants, what do you guys think? And please help me out... for plants i have an Amazon sword another sword (not sure exactly what kind) a bunch of Bacopa Caroliniana, Some dwarf hair grass I got not to long ago and its not carpeting yet but slowly growing... some hornwort, java moss.
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