2. LEDs on the base, shining up/out
For larger lightboxes, you will achieve a better effect by fitting the LED strips to the inside back of the box (directly facing the acrylic front panel).
Spacing between LED strips
The spacing between the strips depends on the depth of the light box, that’s to say the distance between the back of the box and the front panel. To be safe, we recommend the gap between your LED strips be the distance between the back of the box and the front panel, less 25% or so.
For example, if the lightbox is 100mm deep, the LED strips on the base should be spaced
100mm – 25%
= 75mm apart.
(In practice, you would probably get away with positioning the strips 100mm apart. But because no two acrylic panels are the same, going for 25% tighter spacing will ensure a nice, even lightbox effect for most builds.)
Acrylic LED lightboxes are an excellent way to pick up illumination while hiding the light-source from direct view.
They’re great for adding ambience to clubs, bars and back-bars. Residential applications include splashbacks for kitchens. And with colour-changing (RGB) LEDs, you can even apply the principles of lightbox construction to construct a beat-controlled dancefloor.