Need help on lighting

[gwabbie]

hi all. i just got myself a 2ft T5 dymax light.
the name written on the box is DYMAX REX-2 AQUARIUM LIGHTING
it has 2 tubes from dymax of Tropical 14W tubes. (it writes tropical 14W)
what is the k for it? as in the 6500k or 10000k?
im using it for planted tank.
is it suitable?
anyone using this light too?

[lEddyl]

you can check out http://www.adec.com.sg/
but i think it's highly suitable

[kzi]

Bro Eddy,

The link show various type Dymax Light.

It has not explain on 6500k or 10000k.

I am curious on this too.

Regards,
kzi

[Aquaculture]

K means Kelvin. The higher the k, the 'whiter' the light is.

[medicineman]

Dymax's 12,000K light has a slight tint of blue to it. The lower K dymax (I think it was 8,000K) is just whiter with no hint of blue tint.

The 12,000K can be used as plant bulb though it is a matter of prefference if you like crisp white better then it is better to go for the 8,000K.

[valice]

Just to let you know, your T5 is not the High Output version but the Normal Output version. It wouldn't be a problem if all other components (CO2 and nutrients) are low.

As for what the K means, it is in fact based on the colour of the light radiated by a heated black-body radiator at a certain temperature measured in Kelvins (K). One example is like our Sun, our sun's outer temperature is about 6000K and it is slightly yellowish. Or another example will be a red coloured or blue colour star where they surface temperatures are cooler and hotter than our sun respectively.

The link below is quite a good read for those who wants to know more about colour temperature.

http://en.wikipedia.org/wiki/Color_temperature

[gwabbie]

Just to let you know, your T5 is not the High Output version but the Normal Output version. It wouldn't be a problem if all other components (CO2 and nutrients) are low.

As for what the K means, it is in fact based on the colour of the light radiated by a heated black-body radiator at a certain temperature measured in Kelvins (K). One example is like our Sun, our sun's outer temperature is about 6000K and it is slightly yellowish. Or another example will be a red coloured or blue colour star where they surface temperatures are cooler and hotter than our sun respectively.

The link below is quite a good read for those who wants to know more about colour temperature.

http://en.wikipedia.org/wiki/Color_temperature

im going to use this T5 light for my 2x1x1 tank to keep HC.
cos i know HC needs much higher lights rite?
for a 2x1x1 tank, is 2bps too much?
what ferts are good for HC growth?

[kzi]

Thank you for the relevant info of "k".

kzi

[rykellim]

Hi, thanks for the quick lesson on the Kelvins (K). It certainly sheds some light! (pun intended)

Anyway, pardon my digress... I have somebody who "downgraded" from "Daylight" florescent lamps to "Cool White" ones, which is a bit tad on the yellowish. He has bad eyesight. Is there a health risk associated with using lamps/bulbs that are too high in K, just out of curiosity?