The Jansjo are 220 lumen and 2700K according to the specifications, they use a Cree LED XPE module with the same specs. I noticed they had a yellowish cast, that's what they looked like to me. If I used them during an exposure, had to make to use white balance. These are reading lamps, so the warmer color. Also suspect the 2700K LEDs don't cost as much as the higher color temperature LEDs.

The 5000K CMA1306 LED is beautiful white, and very intense. Just completely modifying all my Jansjo, 3 have the ~1000 lumen 5000K CMA1306 and one the 2400 lumen 5000K CMA1561 shown here. This will require pulsed operation and likely be able to produce 3000~4000 lumens pulsed, 14~18 times as bright as the Jansjo!! The reflector can't be used with this LED COB tho, the illumination surface area is too big as is the COB.

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(Download)

Well this is pretty simple, the LED COB install is very straight forward and easy. For the power supply if you don't want the pulsed capability, then a simple 12 volt 1 amp supply with a 5.6 ohm 2 watt resistor should work. You may need adjust the resistor slightly to get the desired current, this would be for about 1/2 amp.

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If you are using the popular and versatile IKEA Jansjo LED lamps for macro illumination this modification might be worthwhile considering while being stuck at home. The Jansjo has a 220 lumen output at 2700K, thus a yellowish orange cast light and not really bright, so more output and better color seem like something useful to pursue.

The general idea is to replace the Jansjo LED module with a higher output, 5000K LED COB from Cree, for example: Cree CMA1306 1000 lumen COB. Turns out this is very simple modification and details can be reviewed here:

https://www.photomacrography.net/forum/viewtopic.php?t=41464

Long story short, these Cree CMA1306 LED COBs fits with only a slight modification to the reflector and produces a very bright, beautifully white illumination. LED COB power required is ~9V at ~700ma for full output, see above for more details. I've run at ~500ma at 9.2 volts and the case gets warm, but not too hot to touch, although I wouldn't recommend going to the rated 700ma or higher for long periods unless you can increase the heat sink area. This is why the pulsed operation was developed, allowing much higher outputs for short periods without creating an excessive heat load for the case.

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Jansjo LED Lamp with reflector removed

(Download)

LED Module removed

(Download)

Cree LED COB 2 wires soldered

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Final assembled result

(Download)

For those DIYers that want to get into this area without spending a fortune, here's some notes on a surplus eBay Piezo Stage and a Voice Coil Motor (junk speaker) utilized as a focus stacking stage. I've developed custom controllers for the Piezo and Voice Coil Stages that operates from a Raspberry Pi computer without any additional support...and only require a single ~12VDC power source for the controller!

Be sure to follow the threads that go back to the PM site, this is where the details reside.

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http://www.photomacrography.net/forum/viewtopic.php?t=39962

https://www.dpreview.com/forums/thread/4421829

Always move in the same direction when stacking, and use uniform steps less than the DoF. Almost all focus rails have backlash, even the automated types, and moving in one direction when stacking reduces this effect.

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He was testing flash bulbs with his Kodak Brownie. Put one in, flash..."yep, that's a good one", then another flash bulb, "this is a good one too" and so on. Very funny.

Agree, I loved his show. He could make you laugh by his facial expressions or simple actions, later followed by Benny Hill, Mr. Bean and Robbin Williams.

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I remember Red Skelton testing them :>)

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Rotary axis stage has been added for XYZR capability.

https://www.dpreview.com/forums/thread/4342793#forum-post-62789181

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Here's the referenced 800X magnification video showing the effects of movement induced vibration control.

https://drive.google.com/file/d/19wE-B-dMesEXNtEZ552h_VnpWOjA0n0B/view?usp=sharing

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Bob,

Thanks.

This has been an effort in the quest of an ultra-precision fully automated Stack & Stitch System capable of rendering final images of greater than 30,000 by 20,000 pixels comprised from over 10,000 individual images and resolving down to microns.

To do this requires not only extreme precision but also fast image captures. Capturing 10,000 images at 10 second intervals requires ~28 hours, my goal is to get this to 1~2 second intervals but still maintain that level of resolution and precision, so self-induced vibration control (camera shutter, motor/rail movements) is a must. As you might have seen from the 800X video, I'm already there!!

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Updates from Mike's Labs!

https://www.dpreview.com/forums/thread/4342999

Also see from PM site.

http://www.photomacrography.net/forum/viewtopic.php?t=39756

http://www.photomacrography.net/forum/viewtopic.php?t=39396

http://www.photomacrography.net/forum/viewtopic.php?t=39755

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Here's a list of the videos that have been updated.

Single Axis Focus Stacking System

https://drive.google.com/file/d/1elblFjdob9-MGcsZnNiCspKWZu25G33w/view?usp=sharing

https://drive.google.com/file/d/19g4uJzEgxS5SRHteb8iqJWizakuQmsXt/view?usp=sharing

https://drive.google.com/file/d/1j8hIgvMViMYzZWRZ6W3x-5TfrV-E1Xgc/view?usp=sharing

Fully Automated Stack & Stitch System

https://drive.google.com/file/d/1XHR1tIL02lJmklQYdRg9v67ytTmAJYhD/view?usp=sharing

https://drive.google.com/file/d/1gm8jZBt4cXJrfoLKiRWcX1HO-Wl3yNrz/view?usp=sharing

https://drive.google.com/file/d/1p5SklfGI3iO9Axe3CcM7GhXplleME_9J/view?usp=sharing

https://drive.google.com/file/d/18GxU2UnlrG4TGF2vXnAgTPAC6ogPKGIN/view?usp=sharing



Vibration Reduction Demo utilizing a IC package pin of 400 microns diameter as subject. 10X lens with D850 at maximum digital zoom shows almost no induced vibration when rail is moved to position.

https://drive.google.com/file/d/1z3bgXYc2gXYYY7rJ-g34RcwsC-RTplLY/view?usp=sharing

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Just updated the last S&S Operational video, this is a little better IMO.

https://drive.google.com/file/d/18GxU2UnlrG4TGF2vXnAgTPAC6ogPKGIN/view?usp=sharing

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Mark,

Thanks, but not quite finished! Still working the motor control current waveform parameters and profiles, this is to further reduce motor/movement induced vibration and not excite system resonances.

Engineering "curse", we are never satisfied with the end result, there's always room for improvement!! The "blessing" is when you realize what you've achieved is "good enough"!!

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Here's a few videos of the Fully Automated S&S System (3 axis) I've been developing. Watch the Single Axis Videos above before these because these reference those Single Axis Videos and don't go into the detail they do.

These videos aren't very good, I've only done the previous mentioned videos as my 1st attempts and they haven't been edited, so don't expect much!

The setup uses a THK KR20 with 1mm threads on the Z axis and a pair of KR15s on X and Y. All are controlled by Pololu Tic-500 and these are USB connected to a Raspberry Pi 3B. The Pi is used with VNC to allow remote operation without need for a monitor, keyboard, nor mouse.

Here's the videos, first is the hardware, then software and a couple operational videos (last is long test stack operating quickly).

https://drive.google.com/file/d/1gZqxISGSvuFUqvRiHP5Bf0SFkAyqziCI/view?usp=sharing

https://drive.google.com/file/d/1J4eaSVyoya0N83O2n_-Ty6pVvdF73_fJ/view?usp=sharing

https://drive.google.com/file/d/1s4lN3Qi4PYMHuO6swIcT6YPGpDOKjcaZ/view?usp=sharing

https://drive.google.com/file/d/1f6hYPF09FF5dbehgmX2CdTmxn8J-53II/view?usp=sharing

Best,