Ring Light DIY LED's

[dicklaxt]

Are these setups any good,I have a number of different rated power supplies so could match one up that had enough output to drive any number of LED's.

I could make a larger ring mount(say 6 or 8 inches) with a pedestal and position it at the open side of my light box and shoot thru it with what ever lens set up I opted for.

These are steady burn auxilliary light sources that you can diffuse as you see fit.It could be rigged with a number of selector switches to get some really wierd but possibly unique effects.

dick

[lankforddl]

I created a couple, the first failed and the second was good. Cost me about $45 but it's no MR-14EX. I enjoyed the process. I may try another one when the semester is over. The best part was applying some electrical physics in calculating the power needs and resistors. Never thought I'd use ohms law! lol I attached some pics. I think those were taken from my iphone so disregard the poor quality.

[lankforddl]

here's a couple more

[dicklaxt]

Is that a large flanged ring you have attached to the Polarizer ring or is that all in one piece. Where did you locate such or is it a Hybrid you put together?

dick

[lankforddl]

Is that a large flanged ring you have attached to the Polarizer ring or is that all in one piece. Where did you locate such or is it a Hybrid you put together?

dick

cokin adapter mount, old polarizer lens with glass removed. The white thing is the plastic packaging that a toilet base ring came in. LEDs were soldered to a circular curcuit grid. 1 resistor per every three 5mm LEDs. power source: 4 AA batteries in a radio shack battery housing with a switch. I had two types of LEDs with two different switches. pure white or 7000K and tungsten at about 4000K. When used together they create a broader light spectrum or they can be switched on and off separately.

I put this thing together from stuff around the my house and spending too many hours walking aimlessly around home depot. glue, solder, electrical tape, etc... lol

My next version will be from a model train mold set. I'm going to actually make the plastic housing with a semi/transparent material.

[themadman]

Neat setup! I'm a EE major myself (well... I graduated) and I've been thinking about constructing something like this. Anyways, it looks really neat, looking forward to your next version!

[dicklaxt]

I am trying to visualize the use of a diode in an array of LED's I always thought reverse polarity of an LED not to be a problem, it just would not function.

Let me pick your brain further by asking/making a couple of statements/questions for comment....I would think the position of the light ring in relation to the plane of the lens face would be critical so that any side light from the LED does not reflect directly on the lens face.In otherwords it should be behind the front of the lens ,you may have accomplished this by recessing the LED in the foam.

The Kelvin rating of a LED is hard to find in specifications ,,,,,,,,how did you determine this.I agree using this in the design of a ring is useful when experimenting with whats the best approach.I like to know that the resultant exposure good or bad was because of using the inner most ring of LED's that were rated in 7000K and not just that the inner ring location being the driving force.

dick

[dicklaxt]

I have been doing just a tremendous amount of reading about this subject and find that even tho there are many light rings being manufactured and are available from a few dollars to several hundred dollars, I'm not finding them do be in use very much by the amateur photograper or the pros for that matter.I am sure they have there place in photography under special considerations/conditions.

I don't doubt that I could build one and that it would work,I have the background to do so, both in tinkering and electricity/electronics.I did order one of these rings(lower end by cost) and it will probably be a POS but still fun to play with.

I guess what I am saying is I'm not finding a LED light ring an absolute need in my arsenal of accessories.

I'll pass,learning about them has been fun.

dick

[lankforddl]

I am trying to visualize the use of a diode in an array of LED's I always thought reverse polarity of an LED not to be a problem, it just would not function. The circuit will work fine without diodes or resistors but I wanted to ensure longevity of batteries, and LEDs. I picked a physics proffs brain and he recommended using them, mind you this is all experimental but it works

Let me pick your brain further by asking/making a couple of statements/questions for comment....I would think the position of the light ring in relation to the plane of the lens face would be critical so that any side light from the LED does not reflect directly on the lens face.In otherwords it should be behind the front of the lens ,you may have accomplished this by recessing the LED in the foam. OK, the LEDs have a 30 deg projection. theoretically they don't shine on the lens only outwards at the said angle. the ring is removable and often times I find myself holding the ring with a clamp as well.

The Kelvin rating of a LED is hard to find in specifications ,,,,,,,,how did you determine this.I agree using this in the design of a ring is useful when experimenting with whats the best approach.I like to know that the resultant exposure good or bad was because of using the inner most ring of LED's that were rated in 7000K and not just that the inner ring location being the driving force. I used a light meter and the following equation reflected-light exposure equation to estimate/calculate kelvin rating. found some data and solved for the K. the light intensity was estimated at an approx minimum working distance 6-10 inches. .

dick

OK, now that's that all done. I'm a biology major and this electrical stuff is just for fun. I can't be held responsible for my inaccuracies. But if the dang thing works and it has then BOO YAAH. lol.

[dicklaxt]

All right, BOO YAAH,,,,,,,,,,,,, smile

dick