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My DIY LED ring light
Topic Started: Feb 1 2011, 12:50 AM (887 Views)
Aimevous
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Here's a video of how it looks like.

from: http://www.facebook.com/video/video.php?v=10150095683542057

It is basically a 120-LED flexible light strip sandwiched by 2 "da bao" container caps taped together using black cloth tape.
I soldered on a connector so it can be powered by a simple battery pack or AC via a generic transformer at 9-12V.
The whole thing is taped to a 55-77mm stepup ring pretty tightly.

this is a quickie job so u can see the rough cuts in front and the lack of alu foil behind. But I'm quite happy with it as it is quite portable now, except that its a bit ugly. So when I have time, I'll re-cut the "da bao" caps and put some nice alu foil to reflect the rearlights and maybe spray/tape up the rear to be completely black.

Any other comments or suggestions will be appreciated!


btw the "piak" sound when the light is turned on isn't coming from the light or battery or anything. Its just the plastic switch on my wall socket being damn tight. Currently its powered by AC via a generic transformer. I have the battery pack ready too but its not in the video..

will probably put up some photos over the weekend =)
Edited by Aimevous, Feb 1 2011, 01:04 AM.
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cjng
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Mr.Oink
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how much current is the LED light strip drawing from ya batter pack?
Care to should how you mount or connect to the batter pack?
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tankm
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:thumbsup1:

How bright is this setup, what's the typical shutter speed using this light at ISO200, f4 subject at around 1 feet max ?
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Aimevous
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Mr.Oink
Feb 1 2011, 06:40 AM
how much current is the LED light strip drawing from ya batter pack?
Care to should how you mount or connect to the batter pack?
Sorry, I don't have a multimeter so I can't measure...

here's my diy battery pack. its just 8 x AA batteries with a soldered on connector.
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This is the part from the LED light, currently its connected to my AC adaptor. The connector is also soldered on myself.
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Aimevous
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tankm
Feb 1 2011, 09:00 AM
:thumbsup1:

How bright is this setup, what's the typical shutter speed using this light at ISO200, f4 subject at around 1 feet max ?
Hi,

I was trying it out at some objects on my table, I would say its between 1/30 to 1/60 on my 35mm lens @ F/4 ISO 200.

Kind of weak, I suppose. Perhaps can be slightly stronger after I add some alu foil to the back to transfer the back spill forward..
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Mr.Oink
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Are u using 5mm LED light strip?
5mm LED has very poor light output or low lumen.

Maybe u can try SMD5050 light strip, they produce much better output.


BTW I'm asking abt the current, because the efficiency of LED is determine by its current.
Usually LED need about 12V @ 1A to drive the LED but at full load, but for efficiency, its usually driven at 750mA.
to get the best output ratio.
Edited by Mr.Oink, Feb 1 2011, 01:48 PM.
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Aimevous
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Mr.Oink
Feb 1 2011, 01:44 PM
Are u using 5mm LED light strip?
5mm LED has very poor light output or low lumen.

Maybe u can try SMD5050 light strip, they produce much better output.
Hmm.. frankly I'm not too sure. I got mine from here:
http://www.dealextreme.com/p/120-led-120cm-12v-soft-light-strip-white-7561

Any idea what it is?
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Mr.Oink
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Aimevous
Feb 1 2011, 01:46 PM
Mr.Oink
Feb 1 2011, 01:44 PM
Are u using 5mm LED light strip?
5mm LED has very poor light output or low lumen.

Maybe u can try SMD5050 light strip, they produce much better output.
Hmm.. frankly I'm not too sure. I got mine from here:
http://www.dealextreme.com/p/120-led-120cm-12v-soft-light-strip-white-7561

Any idea what it is?
Hmm..you are using he 5mm LED.

U should try getting this :)
http://www.dealextreme.com/p/5050-18w-700lm-6300k-white-light-strip-dc-12v-42722
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Mr.Oink
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Dealextreme also sells LED drivers where there deliver 12V and limit the Current to 750mA or 1A.
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