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Can you add more light without adding more heat? (alien.top)

submitted 10 months ago by CharlesBrooks@alien.top to c/photography@viewfinder.pro

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Does more light always mean more heat?

I'm trying to illuminate an extremely small dark space, but bringing my lights closer to the subject risks damaging what I'm photographing. (Using Apunture 600d LEDs with Fresnel heads).

I'd like to stick with continuous light if possible, since I'm also pixel-shifting for resolution in this series.

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[–] Automobilie@alien.top 1 points 10 months ago

Can you add a fan?

[–] George_PHCB@alien.top 1 points 10 months ago

Is the subject moving or still?

[–] Davie_Prod@alien.top 1 points 10 months ago

I'll stick with strobes like the pros do

[–] TheOnceAndFutureDoug@alien.top 1 points 10 months ago (1 children)

So I saw you were using Pixel Shift and that's why you can't use strobes.

Another solution is just change your technique and do the post-processing manually. There are plenty of tutorials online that show how to do super-resolution by simply taking a lot of images and stacking them in Photoshop.

If you do it right you can take a 10 MP camera shooting at 200 ISO and make a 100 MP image at relative 10 ISO. You just need to take a bunch of photos and stack them.

[–] CharlesBrooks@alien.top 1 points 10 months ago

Good idea. I'm going to look at this. There might be issues with parallax if I'm moving the lens position, but if I attach it to an astro head and program it to move in the sub-pixel range that might work. Also just the variation in the strobe output may be enough . If nothing else I'll at least get noise reduction from the stacking.

I'm also doing heavy focus stacking in this series, so adding out-of-camera pixel-shifting will increase the image count to a few thousand per shoot... But I'm getting used to dealing with that quantity of data!

[–] SecretEmployee7612@alien.top 1 points 10 months ago

How about using mirrors? You can place the hot lights well away from the violin... yes, you're going to need even bright lights, but it might be worth trying.

[–] itching_for_freedom@alien.top 1 points 10 months ago (1 children)

LEDs emit very little UV or IR which is what damages illuminated subjects. The safe illumination distance on the most powerful LED film lights from Arri is only about 3ft, which is only double the safe distance for heat around the entire housing. (This is based on 8hr continuous illumination).

By comparison for a similar output Tungsten head you're looking at distances of 3m and for HMI heads as much as 8m.

These are high end motion picture lamps so it's possible they have better spectrum control than Apurture lamps, but they're also emitting substantially more light so I can't see something like a 600D being an issue as far as IR or UV emission.

So unless your "small dark space" is literally the size of a wardrobe LED heads should pose no heat risk to your subject.

[–] CharlesBrooks@alien.top 1 points 10 months ago

My small dark space is the inside of a 300 year old Violin. The apunture lights can heat the varnish to unsafe levels in around 30 seconds.