Quote:
Originally posted by jks1
lets throw a wrench in here, why is a 250W 10K bulb considered "more intense" than a 250W 20K bulb? Is this a PAR difference between the bulb, or just a color thing? |
It's not a color thing. The 10K lamps generally put out more PAR than 20K lamps, simple as that. The problem with 20K lamps is that mostly they only put out one large spike in a small wavelength (450nm). and little in the rest of the spectrum.
Theoretically there is no reason a 20K lamp could not put out more PAR than a 10K lamp. I think the manufactures just haven't found the right combinations of halides to make this happen yet.
Quote:
Originally posted by Cougra
It has to do with the colour of the bulb. It takes more energy to produce the high K light, thus less par is produced.
By the time you come across the extremely hot blue flames you are in the 10,000K to 20,000K range. Although those blue flames are extremely hot, they don't give off that much light. |
Not entirely true. It does take more energy to make the blue light, but humans see color and perceive brightness different than it really is. So we tend to see greens and yellow as more bright than reds and blues. Really, someone should be able to make a very blue lamp that has high PAR, they just haven't yet.
Spectral curve for a true 12K
Spectral curve for a true 6K
It's just a PC lamp. Not very bright for our applications.