Tropical Fish Keeping - Aquarium fish care and resources

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MoneyMitch 10-15-2009 07:35 PM

what determines kelven ratings?
ok so got a question about the different types of lights out there (compact flouro's standard flouro tubes and incandescent lights) what determines the kelven rating of the mentioned bulbs?

baron von bubba 10-15-2009 08:10 PM


Originally Posted by MoneyMitch (Post 258077)
ok so got a question about the different types of lights out there (compact flouro's standard flouro tubes and incandescent lights) what determines the kelven rating of the mentioned bulbs?

some stuff here that may answer some things....

Compact fluorescent lamp - Wikipedia, the free encyclopedia

Color temperature - Wikipedia, the free encyclopedia

MoneyMitch 10-15-2009 11:40 PM

thats alot of information there lol. maybe someone could brake it down into a little bit more simpler terms if possible? im trying to find out what kelven my 42W cfl bulb burns at. its a bulb that fits into a lamp but i have a fixture that i can put over the tank and wanna know what the kelven of it is. thanks for all the raw info though once i get a basic laymans understanding about this hopefully i go go to the links you provided to learn more, i jus tneed a more i guess basic explination lol.

Jack Middleton 10-16-2009 02:09 AM

if you take the bulb, there should be some information on it.

It will normally tell you the wattage, colour temperature and CRI

MoneyMitch 10-16-2009 02:18 AM

only info on the bulb base is 42w 60hz and 620mA? doesnt have a k rating anywhere on it.

baron von bubba 10-16-2009 04:52 AM


Originally Posted by MoneyMitch (Post 258276)
only info on the bulb base is 42w 60hz and 620mA? doesnt have a k rating anywhere on it.

no idea on how you would actually find out what k rating a tube is.
if its redish light the rating is lower if its blueish/white the rating will be higher.

however the actual k rating has little or no impact on the growth of plants, its just down to personal preference of the viewer as to what "colour" light looks the best.

have a read through this post!
K rating on bulbs and Plants. - Aquarium Plants - Barr Report
pay particular attention to ceg4048 and Tom Barr.

WisFish 10-16-2009 09:08 AM

Without electronic equipment to measure the K rating, you have to rely on the manufacturer labeling the bulb or the package.

MoneyMitch 10-16-2009 11:59 AM

well from the barr report, i havent read the whole thing yet im at the part where they said plants can use any spectrum and that kelvn is more of a selling point than a factual point noadays but after i finish the whole thing im sure ll have more questions.

MoneyMitch 10-17-2009 03:18 AM

wow learned soooooooo much about lighting there, LOVE that thread that was linked kudos!!!

makes me want to let the rest of the forum know about this great info. totally made my decision up between a walmart fixture and a coralife fixture (goin with the walmart fixture).

just want toi get some clarification from you guys about a a few quotes i found

It is the amount of light you use that determines just about everything else for the tank. If you have X watts per gallon for a standard geometry tank, that dictates that you need to use pressurized CO2 and good fertilizing. If you want to do without the CO2 you need to reduce the light to Y watts per gallon maximum. If you decide to use Excel, you can go a bit higher than Y watts per gallon, but not up to X watts per gallon.

This is because it is light that drives the growth rate of the plants, and it is that growth rate that dictates the concentrations of nutrients that you need to keep in the water, including a carbon source. When you have more light intensity than you have nutrients available to support, you don't get the healthy growing plants that are needed to discourage algae from starting to grow.

If 2 watts per gallon dictates using CO2, then if you don't use CO2 you need to reduce the light intensity. Does all of that make any sense?

A contrary viewpoint is that you can acclimate the plants to grow well with lower levels of nutrients for a given amount of light, but you have to be willing to suffer through some algae problems as they acclimate. I haven't tried this, but those who like the leaner fertilizing methods, like PPS or Pfertz, insist it works well.

this means i can get high light plants not based on kelven but wattage, then with a tank that measeures x you cnnont exceed y wattage or you will need co2 to balance everything?

then one more here

As far as what was said about the K rating not mattering, it's more a choice of aesthetic color choice by yourself, not growth of plants.

Then the normal cheap cool FL's work as well as the designer bulb color mixes if growth is the variable measured.

Aesthetics you can measure in other, more social scientific methods.
But as far as growth, they are in fact the same as far as the studies that have been comparing the two.

So pick a bulb that has a nice appealing color to your eyes/your senses.
But do not fall for the claim about better growth, less algae and the rest........

If you want real pretty reds, just buy Tom Barr's "Red Plant Paint" and get a brush. I gar-untee it'll make your plants red

Tom Barr

and this means i dont need any fancy setup to grow high light plants and just reinforces the case that you could even use regular house lights then as long as you have enough wattage? (that quote was actually taken from tom barr himself)

Jack Middleton 10-17-2009 04:14 AM

you can use standard lights, but when you say standard, are you referring to the round circular bulbs? if so a lot of the light is lost because there is not a reflector available which can capture the lost light.

Standard household tubes are fine to use, In the UK we have a website called lamp specs, ive bought a 5 year supply of tubes for my tank for just under 10

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