Based on the answers to my question Can I use a LCD as backlight for acquiring film using a DSLR? and the link provided about optimal light sources for negative film I would like to build a light source which emits no orange at all, so that the orange of the film won't be recorded by the camera.
I can find LEDs for the purpose, but they are individual light sources with various light spread curves.
How can I arrange them to build a homogeneous light box? 3D printing is possible so I don't need to be restricted to existing products.
I would intermix LEDs of the different wavelengths, but should I put sources on the side walls of a white light box which has diffusing walls and back surface? should the box be square or circular? circular may benefit from the 1/r rule and result in a more homogeneous light on the back wall/diffuser. Or should I put them not on the sides but on the back side, behind one or two diffusers? or maybe on the walls but directed to the back?
I have no experience on the topic and the goal is to obtain a uniform light field. It will be diffused light, not collimated. Collimated may be much more difficult so I can skip it for now.
Let me know if this question is more suited for engineering.SE