Progress Challenge 5

Experimenting with Light Sources 
 
Luminous efficacy. 
How well different light source produces light.

We had to choose different light sources ( globe types) to see how these can effect an object, lighting and colour when taking photographs as well as the flow on effect of these lighting choices in a lighting plan.

 These are the globes I chose to use.

I set up a small studio area so that all the conditions could remain the same for each photo. That way I could see the difference each globe was really making. My control photo started with just natural light and the camera on a tripod. All the camera settings stayed the same.

My first object was a bowl of fruit. Most of the fruit has a matt surface. I could see how a matt surface would react to the introduced light sources. Also there was a good variation of colour. The 1st photo I took was just of natural light then I would have a control photo to use as a reference. This also then combined natural light with the an introduced light source. You can see the results bellow.


Natural Light
Object 1 - matt surfaces

Natural day light has a 

CCT of 6000K a cool hue.

My studio was set up in a outdoor space underneath a yellowish laser light roof. This counterbalanced the cool hue of the daylight and that is why the picture appears neutral in hue.

I used Natural light as my control. The camera was set up on a tripod and the camera setting all stayed the same. The different light sources were all from the same place on the right hand side.

Incandescent globe
Object 1

An incandescent globe has a CCT of 2800 K

This produced a warmer colour hue to the finished photo than the natural light photo. The object is lit by natural light and by placing the light source on the right hand side you can see this creates a shadow on the left hand side.

Compact fluorescent lights 50-75
Object 1

A compact fluorescent globe has a CCT of 4000 K

This produced a more natural hue to the finished photo. The object is lit by natural light. By placing the light source on the right hand side you can see the shadow on the left but on flare on the fruit except the apple.

Light-emitting diodes 15-30 LED

Object 1

A compact flurescent globe has a CCT of 3000 K

The LED light source fell mostly on the objects therefore the background was less effected by the LED light, and there is some flare on the fruit as LED globe have such strong directional ability. The light source was on the right hand side but as the objects, apart from the apple are matt, there are only small flares produced by the addition of the light source.

Halogen lamps 10-25
Object 1

A Halogen globe has a CCT of 2800 K

This produced a very warm colour hue to the finished photo. This globe was in a bed side light. I feel the K rating of the globe must be much lower, around 1500K as the photo is so much warmer. There is no flare on the fruit in this image ( except the apple that is shinier) 

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My second objects were a bit more eclectic. I chose them to see the difference a shiny surface would make in the lighting test. They also had a good variation in colour and texture. The 1st photo I took was just of natural light again, then I would have a control photo to use as a reference. This also then combined natural light with an the introduced light source. You can see the results bellow.

Natural Light
Object 2 - Shinny surfaces

 Natural day light has a 

CCT of 6000K a cool hue.

My studio was set up in a outdoor space underneath a yellowish laser light roof. This counterbalanced the cool hue of the daylight and that is why the picture appears neutral in hue.

I used Natural light as my control. The camera was set up on a tripod and the camera setting all stayed the same. The different light sources were all from the same place on the right hand side.

Incandescent globe

Object 2

An incandescent globe has a CCT of 2800 K

This produced a warmer colour hue to the finished photo. The object is lit by natural light and by placing the light source on the right hand side you can see this produced light reflections on the shinier objects.



Compact fluorescent lights 50-75
Object 2

A compact flurescent globe has a CCT of 4000 K

This produced a more natural hue to the finished photo. The object is lit by natural light. By placing the light source on the right hand side you can see this produced light reflections on the shinier objects.



Light-emitting diodes 15-30 LED
Object 2

A compact flurescent globe has a CCT of 3000 K

This produced a quite similar to an incandescent globe.  However the beam of light was much more directional and fell mostly on the objects therefore the background was less effected by the LED light. The object is lit by natural light. By placing the light source on the right hand side you can see this produced light reflections on the shinier objects.



Halogen lamps 10-25
Object 2

 

A Halogen globe has a CCT of 2800 K

This produced a very warm colour hue to the finished photo. The object is lit by natural light and by placing the light source on the right hand side you can see this produced light reflections on the shinier objects. This globe was in a bed side light. I feel the K rating of the globe must be much lower, around 1500K as the photo is so much warmer. 

Lighting can play such an important part of how a space will feel, something I think few retailers get right in their change rooms. It can mean the difference between me buying the item of clothing or putting it back on the shelf. Imagine how much more $$$ they could make if they could get that one thing right.

CCT Value of different globes

Resource

http://www.popularmechanics.com/technology/gadgets/reviews/g164/incandescent-vs-compact-fluorescent-vs-led-ultimate-light-bulb-test/