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Effect of led lights on photography?

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Posted by PatricS: Mon May 12th, 2014 01:55

1^st Post

Hey all, What is the effect of leds in photography? C, i am not a photographer but just need to know about it!!

Any reply would be appreciated. Thanks

Posted by jk: Mon May 12th, 2014 18:09

2^nd Post

I know that some of the members here have experimented with LEDs but I havent so I cant comment.

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Posted by TomOC: Tue May 13th, 2014 13:35

3^rd Post

Some are really clean, some not so much.

Many are adjustable to whatever temp you desire.

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Posted by Robert: Tue May 13th, 2014 13:56

4^th Post

Remember me?

Yes I have been lurking, occasionally...

OK LED's I use a 3 Watt Nichia 365nm UV for my Ultra Violet photography, both for reflected and fluorescent effects. It's good and does what it says on the can.

Visible light photography is another matter, although I do use LED's for my copy stand because of their low heat output and low running costs, their light output spectrum is 'gappy'. I chose a particular lamp because it hasd the best spectral output I could find.

This is the spectrum. The 6000K was bad with a huge gap in the green area, the 3,000K had almost no blue. You need to be careful when selecting your LED's I wouldn't buy one for photography without seeing the spectrum first.

Attachment: Screen Shot 2014-03-31 at 22.54.09.jpg (Downloaded 40 times)

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Robert.

Posted by amazing50: Fri May 30th, 2014 08:33

5^th Post

I use leds for macro work. They are DC battery powered units so there is no flicker problem.

The AC units often flicker with the line current 50 cycles in Europe. Only the better ones have a stablized power supply.

There are some units that have 2 sets of diodes at different color temps. These can be varied to suit your needs.

It's often hard to get spectrum curves as Robert recomended, but shooting a pix of a color calibration chart (Google color calibration and select pictures, there are plenty to chose from) you can determine if the LED has a suitable spectrum for your work.

The attached pix was of Gas prices in N.Germany, I like to compare them to home. Note that the 5 is not illuminated in the pix although it it appears OK to the eye.

This flicker has also been problamatic when shooting video at concerts. Some of the stage lighting will cause flicker. The Nikons have a setting to reduce this and I found it best to set it to 50Hz rather than auto.

A good deal of the flicker can be cleaned up with software but it is time consuming and not 100%.

Attachment: LED Drop Out.jpg (Downloaded 31 times)

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Posted by PatricS: Mon Jun 2nd, 2014 00:12

6^th Post

Robert wrote: Remember me?

Yes I have been lurking, occasionally...

OK LED's I use a 3 Watt Nichia 365nm UV for my Ultra Violet photography, both for reflected and fluorescent effects. It's good and does what it says on the can.

Visible light photography is another matter, although I do use LED's for my copy stand because of their low heat output and low running costs, their light output spectrum is 'gappy'. I chose a particular lamp because it hasd the best spectral output I could find.

This is the spectrum. The 6000K was bad with a huge gap in the green area, the 3,000K had almost no blue. You need to be careful when selecting your LED's I wouldn't buy one for photography without seeing the spectrum first.Ohkay!! Great.. Thanks so much for that.

Posted by PatricS: Mon Jun 2nd, 2014 00:16

7^th Post

Amazing50. You are amazing. A big help but yeah i need to know which company leds would you prefer like patona, toshiba etc. Or company doesn't matter?

Posted by jk: Mon Jun 2nd, 2014 16:47

8^th Post

PratricS what application do you have in mind for the LEDs ?
If we know that then we might be able to work out what LED would be most suitable.

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Posted by PatricS: Wed Jul 23rd, 2014 00:30

9^th Post

Hey jk, Actually i don't have any application in mah mind but yeah i was thinking about leds like candless leds or like led bulbs. Can we use them in photography..e.g.
http://www.patona.de/kerzen-led-e14-smd-2835-5w-230v-3000k-450lm-warmweis-milchglas.html

Like so many bulbs in a row. Hope you get my point..

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