Any one know an incandescant 15 watt bulb that is 6500k or close to that? I need the compact screw in kinds.
Thanks in advance.
Most lights emit a range of frequencies. Kelvin temperature does not refer to the nanometer wave spectrum emitted from the light emits but the over all color of the light. Most common household incandescent emit a low kelvin temperature in the 2,700-4,000 range. Which, IMO anyway, looks terrible over an aquarium since its a ugly yellow light.(FWIW incandescent bulbs are basically glowing wires the put out a whole range of frequescies or k values).
Most lights emit a range of frequencies. Kelvin temperature does not refer to the nanometer wave spectrum emitted from the light emits but the over all color of the light. Most common household incandescent emit a low kelvin temperature in the 2,700-4,000 range. Which, IMO anyway, looks terrible over an aquarium since its a ugly yellow light.
http://en.wikipedia.org/wiki/Kelvin said:Colour temperature
Main article: http://en.wikipedia.org/wiki/Colour_temperature
See also: Stefan–Boltzmann constant
The kelvin is often used in the measure of the colour temperature of light sources. Colour temperature is based upon the principle that a black body radiator emits light whose colour depends on the temperature of the radiator. Black bodies with temperatures below about 4000 K appear reddish whereas those above about 7500 K appear bluish. Colour temperature is important in the fields of image projection and photography where a colour temperature of approximately 5600 K is required to match "daylight" film emulsions. In astronomy, the stellar classification of stars and their place on the Hertzsprung–Russell diagram are based, in part, upon their surface temperature, known as effective temperature. The photosphere of the Sun, for instance, has an effective temperature of 5778 K.
Yes it is tied to the light spectrum, but only very loosely. It is very common for two different brand bulbs with the same kelvin rating to have very different light spectra. Since the kelvin temp is an over all measure of light. This is especially true with the higher kelvin temps as there are lots of ways to make a bright white bulb.FWIW and from my memory the K values refers to the light given out by a black body heated to that temperature. Therefore the k value is very much tied to the wave length of the light. Or at least the light spectrum anyway.
owww heck I looked it up. :lol:
from: Kelvin - Wikipedia, the free encyclopedia
I do have plants so that might be tricky... My thought process is that if 3w per gallon is hight light than a two 13w (60w equivelent) will be 12w per gallon. Figured that high light would stress out my fish and make my low light java fern leaves turn transparent.the CFLs will produce more visible light, they will be brighter
if considering bulbs of both types that use about the same amount of energy (not the 'equivalent to' number for the CFL), most of that energy is converted into nonvisible heat in the incadescent, where a much higher percentage is converted to visible light in the CFL- as much as would be produced from an incandescent using 4x the amount of energy (15 watt CFL equivalent in visible light output to 60 watt incandescent)
if you think it may be too bright, go for the lowest watt CFL you can find, i've seen ones that are 5 watts (30 watt equivalent), but you may be limited in choice of K rating, which is important if live plants are planned
I noticed that cfl 15w is equivilent to a 60w incadescant bulb... A little to bright for my 10 gallon. Are all flourescant lights this bright? Are the tubes this bright?
Also, I want to replace two 15w incandescant, so a 15w compact flourescant is probally not going to work (based on what I've seen). How many watts should I get?
Thanks for all the replies!