True. But the "white paper" I'm typing on right know is a pseudo-white made from RGB, and I'll be amazed if the spectrum is anything like continuous.
Source please. (others have already backed me up)
Andy
Theres a fluro tube colour called Rosetta that has a boosted red end , it dosen`t appear that way but red meat looks all the fresher under it.
Adam
Spectrum not being same as spectral power distribution, Lumileds data sheet you flag up shows a big peak in deep red , tungsten shows a realtively straight line, low at blue and rising to red, but no peaks and troughs.
Adam
LED is getting in as LCD backlight on a lot of things , usually with RGB sources rather than phosphor based lamps.
Most of them do which was another part of Shuji Nakamura`s discovery when working for Nichia, whose main business for previous 40 years had been phosphors for CRT screens.
Adam
L
messagenews: snipped-for-privacy@davenoise.co.uk...
Colour Appearence as in how the light appears aginst Colour Rendering Index which tells you how accurately colours will be shown.
Adam
Growlux - used for forcing plants - tends to enhance many colours.
It isn't - there are big gaps in the gamut produced by CRT or LCD RGB screens.
The rendition from other colour spaces is different again - which is why it is difficult to get accurate colour representation of material printed in CMYK from RGB sourced images.
That's enhanced red for chlorophyll operation, at the expense of blue and green which chlorophyll can't use. (Some plants need other specific wavelengths to encourage flower production though.)
2700K warm white is almost as effective for plant growth, and makes the colours look better to the human eye.
Trouble is that the best meat isn't that horrid bright red ...
Mary
Tungsten has a huge amount of energy in the IR, and slopes off towards the visible -
For example - comparing the point at which the LED starts dropping off at the red - 670nm, the eye has a responsivity of well under 5% of its peak efficiency. Over the range 670-400nm, the match is moderateley good - neglecting the small peak at 470nm or so. (talking of the warm white LED spectrum on page 8, fig 2A of the luxeon datasheet)
-
Admittedly talking good warm white LEDs, they`re definately not all equal, compare the Nichia NCCL023 warm white LED; circa. December
2004. with a no brand, graph directly below Nichia, about 1/4 down page:HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.