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Old 12th November 2012, 11:42 PM   #101
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Quote:
Originally Posted by AndrewT View Post
rubbish !
Agree.

If our sight can be fooled by 3 narrow bands that does not mean that we don't see and don't distinguish what is in between. Take for example blue LED, then red LED, and look at something green lighted by his lights. Then light it by a green LED and compare.

It is a simple experiment, everyone on this forum can do it.

Similarly, like out hearing can be fooled by 200 and 300 Hz tones as if we hear 100 Hz. But it does not mean that we don't hear real 100 Hz and all 100 Hz sounds that we hear result from mix of 200 and 300 Hz sounds.
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Old 13th November 2012, 04:28 PM   #102
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A supermarket in this country has recently started selling these LED bulbs under their own brand. The design looks like nothing I've seen before, three "leaves" folded together like a flower in the dark. It creates a hollow centre that IMO should help very well with cooling the LEDs...

Does anyone have any experience with them?
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Old 13th November 2012, 07:25 PM   #103
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Quote:
Originally Posted by Wavebourn View Post
If our sight can be fooled by 3 narrow bands that does not mean that we don't see and don't distinguish what is in between.
That's because the bands overlap, red & green quite a bit. If they didn't there would be gaps. There is a huge library of research on this going back decades.

Just for run, look at the red response curve of the eye. Notice anything odd? Can you guess what it does?
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Old 17th November 2012, 02:44 AM   #104
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Quote:
Originally Posted by Pano View Post
Do tell (more)
Ok so at my job the machine shop has one of these massive comparators.

Click the image to open in full size.

The light source was from a three leaded mercury arc lamp inside the housing sticking out of the front. The lamp looked like this but with a starter electrode hanging off the side. It only needed 60 volts or so to run.

Click the image to open in full size.

It also has air intake vents for a fan located in the bottom. These lamps are made to order today and are NOT cheap. The power supply was external and had a Sola transformer, some big filter capacitors, and rheostats to adjust the current. The power supply started to get flakey and eventually failed to ignite the lamp.

I mounted the LED chip on a heatsink inside the housing. The mounting screws had springs under them so the heatsink could be adjusted a bit to help with the focus.
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Old 17th November 2012, 10:39 AM   #105
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Quote:
Originally Posted by astouffer View Post
Click the image to open in full size.

It also has air intake vents for a fan located in the bottom. These lamps are made to order today and are NOT cheap. The power supply was external and had a Sola transformer, some big filter capacitors, and rheostats to adjust the current. The power supply started to get flakey and eventually failed to ignite the lamp.

That is HMI lamp. Typically the problem you describe is not because of the power supply, but because as the lamp gets older it gets harder to ignite. That means that you are exceeding lamps life usage, which than damages your power supply. These lamps have very limited life that in some cases is just a few hundred hours. There most likely is counter that counts lamps life if reset when lamp is exchanged.
HMI lamps are very pricey, and few bigger ones ( 8 KW) go for $ 2K price
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Old 19th November 2012, 04:34 PM   #106
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I was going to say it's a xenon lamp (sure looks like one) but it may be HMI. Either way, expensive for sure. Nice that the LED has taken its place.

I've never seen a comparator like that. What does it compare? It certainly is massive, and very cool looking.
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Old 19th November 2012, 05:14 PM   #107
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Quote:
Originally Posted by Pano View Post
That's because the bands overlap, red & green quite a bit. If they didn't there would be gaps. There is a huge library of research on this going back decades.

Just for run, look at the red response curve of the eye. Notice anything odd? Can you guess what it does?
Do you mean violet that means stimulation of both red and blue sensors?

I don't buy it. But I agree it is the way to fool imagination.
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Old 19th November 2012, 08:04 PM   #108
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Here's the LED illumination we have in the breakfast room:
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Old 20th November 2012, 01:45 AM   #109
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Quote:
Originally Posted by Wavebourn View Post
Do you mean violet that means stimulation of both red and blue sensors?
Yes, violet - how do we see it? And why is it often confused with purple?
There isn't much agreement on the subject, just lots of arguing, audio style.
But if you dig around the digital photography forums you'll find the problem pops up often, violet objects that photograph as blue - flowers frequently.

It's interesting but I've not seen a clear answer yet. I'd welcome any info you might have.
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Old 20th November 2012, 01:55 AM   #110
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If violet objects photograph as blue that means that it's poor reproduction. Try to light set of paints (or pencils) of all colors by different light sources. Some of them will be dark when lit by white LEDs or luminescent lamps.

Green color, for example, can be really green, or a mix of blue and yellow that fools imagination as if it is real green.
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