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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Came 150W LED Fresnel?

Terry VerHaar said:
So - I tried the CD reflection thing and, indeed, there does seem to be a reflection of a green and a magenta band. I guess that means they sort of cancel each other out in a normal histogram but will effect the tonal qualities of color and especially skin tone. I guess the next step would be to light some people and colors and see what can be done in color correction. I don't have a proper color chip chart but I suppose that would be revealing as well. Not yet sure how terminal this is... :-/

Again, Matt, thanks for the advice. :thumbup:
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lol @ CD reflection thing (CD reflect rainbow)

Thanks for the test Terry, I ordered two may just use as Back-light or kicker
 
Terry, first off, can you post a picture of the light you bought? I ask b/c Came said that the 150W does not have a fan, so I'm curious if we are talking about the same light.

As for the light quality, there are a lot of potential things going on. Midday daylight is generally even across the spectrum, with a hump around green and yellow. Tungsten light is different, its spectrum increases significantly with the length of the wavelength of light. In other words, tungsten source light has a lot more yellow and red than it does blue and green.

Now how well the gel supplied with the light works is anyone's guess. Remember that traditional +/- green and magenta filters were design for sources with relatively predictable spectral outputs, so converting that output to daylight or tungsten is a solvable problem. But if the spectral output of the light source itself is unknown, then you have no way create a truly accurate filter to correct that source to another temp.

I really appreciate Matt's input, but I have to say that having both a green spike and a magenta spike is really not possible, FWIK. This is because magenta does not have one associated wavelength, i.e., there is no magenta on the rainbow. Magenta is actually the combination of red and blue with no green. So if you have a green spike, you can't also have a magenta spike. (I guess one could counter that the LED light has three narrow spikes somewhere around green, blue and red, but I've never seen such a spectral pattern from an LED source.)

Also, daylight balanced LED's usually have a spike around cyan, so the spike has more blue than green in it. And remember that sunlight daylight has a green hump. So the fact that you saw more green in the natural light than in the LED makes sense.

One thing really working in your favor with using LED's on a Red is that there almost no IR light being emitted. And Red's are pretty sensitive to IR pollution. So you should see significantly cleaner and deeper blacks (esp. synthetic fabrics) than you would with a tungsten or sunlight source.

The other fly in the ointment is the colored filter array over the sensor itself. The Red seems to be overly sensitive to IR and somewhat insensitive to blue. Well your typical daylight LED inverts that. So while you are not going to be able to perfectly mimic a tungsten or daylight source with your new light, that may not be a bad thing. ;)

Thanks so much for sharing!!

Hope that helps a bit!
 
Peter - Happy to post a pic when I get a chance but I can assure you that this is the 150 watt version (with the 1500WS writing on the side). If you look at the pictures on their web site, you will see a red button on the back. That is the button for the fan. It was $299 with free shipping.

EDIT: And the web site does say it is "fan cooled."

As to the discussion of the green / magenta thing, I guess I'll have to noodle on that a bit. :-) Could a combination of violet (<400 and red (>700 nm) create the appearance of magenta? I'd love to see a graph of the spectral output of this lamp, like this one at Cineo (http://www.cineolighting.com/index.php/pages/product_ls/115) but I don't think I am going to invest in a spectrometer any time soon.

Thanks so much for the input!

And, I suppose it makes sense to test the light without the plastic "filters" since they seem only to be cheap clear-frosted and amber-frosted plastic covers. Not sure that add anything.
 
Thanks for the info Terry. Did you happen to do overcranking tests to see if there's any flicker/strobing? That would be also nice to know :)
 
seriously? come on guys, you might as well get a lowel omni light or something for half of this price, youd be way better off.
 
Jordan, if Lowel is making daylight balanced Omnis, let me know!
 
Wow. Anyone else notice that this light is no longer in their store. Just the 100w version... for $400!! Too much demand from REDuser? :-(
 
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Not sure what they were thinking with the 8 way barn doors ? Normal 4 way's would be nice.

Matt Uhry
www.mattuhry.com
 
Yeah - the barn doors are kind of a joke.

EDIT: Matt, can you post a direct link? I am still not able to find it on their site. :-(

EDIT AGAIN: Oh, Matt, I saw the time stamp and thought they were in the store again. Duh. lol
 
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Terry VerHaar said:
Wow. Anyone else notice that this light is no longer in their store. Just the 100w version... for $400!! Too much demand from REDuser? :-(
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Yup' I pickedup last 2 pieces from him
 
Has green spike and does not look very nice on skin - green spike is not a green shift, so you cannot really fix it with - green.

Color rendition very poor. I would never use this thing.
 
Robert Ruffo New said:
Has green spike and does not look very nice on skin - green spike is not a green shift, so you cannot really fix it with - green.

Color rendition very poor. I would never use this thing.
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Just out of curiosity (and for reference), what do you think of higher end LEDs like the light panel and mac techs?
 
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