The edge of this bulb has an annoying pink emission.
Is this standard for this kind of bulb, or what should I be looking for to avoid the "pink"? ...Jim Thompson
-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at
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| 1962 | I love to cook with wine. Sometimes I even put it in the food.
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Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510
hobbs at electrooptical dot net
http://electrooptical.net
Actually, I thought of that... except I have some "paint pens" which are higher density.
But my suspicion is that "EXN+C" is a color specification (the box says 3000K), and the "pink" is for, perhaps, make-up. ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
The Phillips sheet for these does not mention a green bias, but calls the lamps as "a bright white light for accent lighting" (whatever they mean by accent lighting, I am not sure). The colour rendering index is 100 Ra8. So as I understand it they are claiming that over the eight bands, the average colour rendition is 100% in agreement with the colour of light from the sun. However that is an averaged over each band, and in your case is obviously misleading, as light sources are notoriously colour non linear (peaky).
To avoid a color bias order Halogens with a metalized reflector so the surrounding plastic doesn't add its own color.
Problem solved. ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
lamps as "a bright white light for accent lighting" (whatever they mean by accent lighting, I am not sure).
claiming that over the eight bands, the average colour rendition is 100% i n agreement with the colour of light from the sun. However that is an av eraged over each band, and in your case is obviously misleading, as light s ources are notoriously colour non linear (peaky).
_aenaa.pdf
This sounds like total rubbish. Quartz halogen bulbs rely on a stinking hot tungsten filament as their primary light source.
This is a black body radiator, and the spectral distribution is fixed by th e filament temperature (3000K in this case).
Compact fluorescent sources tend to be peaky, and light-emitting diodes are worse, but quartz halogen relies on very different physics.
Could there be gaps in the black-body spectrum due to absorption bands from the gas filling? This would not be particularly important unless you were using a halogen lamp as the light source for a spectroscope researching halogens.
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~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk
It may also be for heat control, which matters with tungsten. Some reflector bulbs use "cold mirror" coatings, which let longer wavelengths through and have lower absorption than cheap metal coatings. In recessed fixtures and track lights, that cuts down the heating of the reflector and socket.
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510
hobbs at electrooptical dot net
http://electrooptical.net
There are no significant spectral dips in QH bulb spectra in the visible, at least not on the ~1 nm resolution scale. (I just did the measurement on Monday, as part of the background work for a blood spot detector for egg grading machines. There's lots of variety in electro-optical consulting, for sure.)
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510
hobbs at electrooptical dot net
http://electrooptical.net
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
the lamps as "a bright white light for accent lighting" (whatever they m ean by accent lighting, I am not sure).
are claiming that over the eight bands, the average colour rendition is 100% i n agreement with the colour of light from the sun. However that is an averaged over each band, and in your case is obviously misleading, as light sources are notoriously colour non linear (peaky).
pss_aenaa.pdf
hot tungsten filament as their primary light source.
y the filament temperature (3000K in this case).
are worse, but quartz halogen relies on very different physics.
from the gas filling? This would not be particularly important unless you were using a halogen lamp as the light source for a spectroscope researchin g halogens.
Phil Hobbs has measured the spectrum, and there aren't. The bulk of the gas around the filament is one of the noble gases - probably argon (which is c heap) and doesn't absorb in the visible. Xenon doesn't either - think xenon arc lamps.
The halogen content probably does absorb in the visible, as will the volati le tungsten-halogen compounds that shift evaporated tungsten back to the fi lament, but there doesn't seem to be enough of it between the filament and the envelope to absorb any significant amount of light. Bromine doesn't hav e any kind of line structure in the visible spectrum - any visible photon s eems to have enough energy to split the molecule into atoms, and iodine is even more soggy.
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This is the paper on bromine's UV and visible absorbtion I cited in my 1970 Ph.D. thesis - I think I've remembered my conclusions from back then corre ctly, but it is a while ago.
I'm guessing that the +C in the EXN+C denotes a 'cool beam' bulb/reflector assembly. These don't have an aluminized reflector. Instead, they have a dichroic reflector which allows the infrared wavelengths to pass through the back of the bulb. The dichroic reflector, not being perfect also allows some red wavelengths through and these leak via internal reflection to the uncoated edges of the glass.
It is OK to replace 'cool beam' bulbs in a fixture designed for them with fully aluminized reflector bulbs. You just can't go the other way, as the fixture might not be designed to dissipate IR from the bulb's backside. The beam will feel somewhat warmer. But this will only be a problem if they are illuminating something that can't tolerate heat (delicate artwork, etc.).
--
Paul Hovnanian mailto:Paul@Hovnanian.com
------------------------------------------------------------------
The Three Laws of Thermodynamics:
1) You can't win.
2) You can't break even.
3) You can't quit the game.
The pod lights are nicely ventilated, so heat is not an issue, just the pink glow showing thru the vents ;-)
And they're 32" above a quartz counter-top... eating there, I'm not even aware of any heat, but then I'm a long-term Arizonan... we don't even fear hell ;-) ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
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