LED Light Panel for 11x14 Enlarger?

[John Layton]

Lots of light...yes indeed! My gut tells me that I'll ultimately need to seek out some top-tier LED's of very narrow/specific (RGB) wavelengths and cobble something together myself...attempting to emulate my super efficient 5x7 Heiland LED/VC head (which I still sometimes need to "power down" while printing 40x60's!).

On the other hand, I do also need to be open to the possibility that I will fall in love, once again...with 11x14 contact prints. And oh my goodness...would that ever solve so many issues! But still...I've got this enlarging itch (enlarging enlarging itch?) that I just need to scratch!

[Peter De Smidt]

Remember Ansel's 8x10 enlarger, the one with a grid of the halogen bulbs? I'd try something similar, but I'd use high cri LED Cob fixtures, possibly RGB, depending on lumen output. Maybe use a lux meter to meter how much light your enlarger puts at at a normal sized enlargement, and then do a test with one of the leds.....Actually, I could probably do that for you, but I'd be limited to 8x10. When you get closer, and if it'd help, remind me. I have a couple of mid-level COB lights. What aperture would you be using your g-claron at? F11? I just built a light box for digital camera scanning using one of the panels, but the lumen output is no where near what you'd need.

[Tin Can]

We forgot Lina!

11x15!

https://www.youtube.com/watch?v=ijpD_O70tuA

[Tin Can]

Yes I do

I have a bigger one

Saltzman mounts 25 Edison sockets with heavy wiring

Round pattern 25” sg

Ifs in my catalogue

[John Layton]

Mr. Can yes I've thought about something similar. In fact, I believe that Uncle Ansel used a multi-edison bulb array for quite some time - and, obviously, quite successfully!

[John Layton]

...or how about this - to realize the maximum efficiency of an LED light panel, I either purchase or create three of them, one just green, one just blue, and one just white. I could have a slot at the rear of my DIY'd horizontal enlarger to allow quick yet stable insertion/removal of these panels as needed for focus (white panel), then testing, and then split grade printing (green and blue panels).

In fact, with a bit of creative and light-proof cowling, I could construct a "panel box" with its own slot, and have this isolated (contact and vibration-wise) from the enlarger by using a blackout cloth cowling to connect box to enlarger, mitigating potential movement of the enlarger during the panel changes.

I might also be able to incorporate an electrical switch mechanism so that there would be just one connecting plug for the timer for all three panels - so I would not need to remove and re-plug during the process.

Sound like a plan?

[Tin Can]

I am recalling my 2013 plot

I covered LED panel wit dark cloth

Not all timers worked

The timer on lagged



More asi remember

[Tin Can]

I bought many smaller one light panels

I made ULF enlarges positives' as gifts to my Doctor

I also used X-Ray to makes stained glass

I bought a Saltzman neg stretcher which I used as "Head'




https://www.amazon.com/dp/B01JJOEK4O...1zcF9kZXRhaWwy

[John Layton]

Mr. Can you remind me, that with respect to my "three separate light panels" post above, and that there may indeed be a slight lag in stable brightness (especially as these panels will likely be DIY) - that I will be using my (shutter-mounted) 305mm G-Claron as an enlarging lens, and will be sure to make good use of its shutter to begin timed exposures only after such stability is achieved.

[Peter De Smidt]

What happens with LEDs is that they get brighter up to a certain temp. As they go above the temperature, they get a bit dimmer. I usually run mine a bit lower than maximum brightness.