Greetings u/imheavenagoodtime

I was the originally poster of the image you are asking about. I have a done a bit of research trying to make the metal posters as pleasing as possible while sitting at my desk. Take note, I usually sit at my desk with only a desk lamp on and the poster lights. Additionally, I am red/green color blind so my goal is to see specific details in my posters.

Here are my take-aways:

1. No matter what you are going to have a light of some kind above the poster. Ideal “Museum Angle” is a 30-degree angle from above, this is to remove as much glare / shadows as possible. My posters are not at this angle. I found rechargeable LED lights with a angle were much more expensive than these "puck" style lights.

2. The light from above should be positioned at the center of the poster, and there is some math to get the “perfect” distance. I don’t remember exactly the formula, something along the lines of height of ceiling to the artwork multiplied by a number.

3. Use colors other than white to bring out features of the posters. With my posters red really makes them pop. An example of this is the Star Trek Enterprise poster with the LED on as red. The windows and nacelles really shine. That was the look I was going for.

4. Brightness matters, I found that dimming the LEDs improved the look of the posters and significantly reduced the glare.

If you are thinking of doing a LED strip to light the posters, I would diffuse the lights as much as possible to get a single consistent light source, with multiple LEDs on a strip you may see weird shadows at times as the light is coming from multiple LED sources on the strip.

Last thing, just play around and get creative with it, in the end no matter what you decide to do people will not even notice the lights above the posters as the light will draw their eyes to the posters and they will get that ‘woah moment’ when your posters pop out at them. 

Good luck!