Most material decisions in additive manufacturing are made on grounds the studio sets aside. Strength under load. Print reliability. Cost per kilogram. The catalogue of available filaments runs deep, and the published criteria for choosing among them tend to be the ones a procurement document would recognise. None of those criteria decide a lighting material.
A lit object is a different problem. The material is not bearing weight, not resisting impact, not being judged at the spool price. It is being asked to do one thing: receive light at the source and release it at the surface. The quality of that release determines what kind of object the result is. A shade that scatters poorly produces a sculpture and a bright spot. A shade that scatters well produces a sculpture lit from within.
The studio tested filaments against that criterion before settling on the one that holds the catalogue today. Jade White PLA Basic, in the form supplied by Bambu Lab. The decision was not a procurement decision. It was a decision about how light behaves inside an object made of polymer.
The criterion
What does it mean for a material to behave well when light passes through it.
The first thing it means is even diffusion. A filament with good optical behaviour takes a point source, whether the LED filament inside the kit or the bulb inside the socket, and spreads its emission across the full inner surface of the shade before releasing it outward. The outer surface should glow as a single body. No region should read brighter than the area around it; no region should fall dark while the rest is lit.
The second thing it means is dimensional stability at the layer heights the studio prints in. Shades in both Série I and Série II are printed at 0.16mm layer height. At that resolution, each layer is a structural decision: a 0.16mm band of polymer that has to land where the slicer planned it, hold its width, and bond to the band above and below without distortion. A filament that warps, sags, or relaxes between layers produces geometry that fights the form. The shade leaves the bed slightly different from the file. The light leaving its surface is then optical evidence of every small failure.
The third thing it means is longevity. A lighting object lives indoors, beside a heat-generating source, often for years. Some filaments yellow over time, whether from incidental UV, the warmth of the kit they enclose, or oxidation in interior conditions. Yellowing on a sculptural shade is not a cosmetic complaint; it is a quiet betrayal of the white the piece was finished in. The studio's criterion was not what the material looked like the day it left the bed. The criterion was what it would look like in the third year of use.
What did not hold
The filaments tested before Jade White failed at different points along these criteria, and the failures were instructive in different ways.
Some filaments produced hotspots. The light source inside the shade was visible through the polymer as a brighter region directly opposite its position, the way a bulb is sometimes visible through a thin paper lantern. The geometry of the shade went unread at the bright zone, because the eye registered the lamp behind the wall instead of the form in front of it. The sculpture was demoted to a fixture.
Other filaments scattered inconsistently across the surface. A given shade would show a band of warmer light through one region and a duller, cooler light through another, even at uniform wall thickness, even with the source centred. The cause was scatter behaviour that varied with the orientation of the print lines: refraction working against geometry in ways that no slicer setting could compensate for. The piece read as inconsistent rather than as built.
A third category looked acceptable when new and discoloured within months under interior lighting. That failure was the slowest to surface in testing and the most decisive once it did. A material that yellows is not a candidate for a numbered edition, because the edition is not the form alone; it is the form in the material the studio committed to.
Why Jade White held
Jade White held against all three criteria, and held under conditions the studio cared more about than the catalogue did.
What the eye notices first is the diffusion. The light leaving the surface is even across the form, without hotspots opposite the source, without cooler regions at the antipode. The warmth is faint. The material does not tint the light heavily; what it offers is the warmth of polymer slightly off white rather than the chill of a clinical translucent. On a piece read in a living room beside an incandescent bulb, the shade joins the same warm field. On a piece read alone, the warmth is a quiet adjustment that flatters the geometry.
That geometry holds because the material holds. At 0.16mm, the studio gets the surface the slicer planned for, with the band structure visible only when the eye is brought close enough to look for it. The form is the form. The light leaving its surface is reporting what was modelled, not what the polymer decided in the moment.
What holds in the moment must also hold over years. The studio has now run pieces long enough in interior conditions to say from observation, not from manufacturer literature, that Jade White does not yellow. The white that leaves the bed is the white that stays.
The studio has not changed this material since lighting production began. New filaments are tested when they appear; the standing material is the one against which they are judged. None has displaced it.
Material consistency is part of what makes each piece comparable to the others. The decision, once made well, does not need to be made again.