light.setShadowDarkness

light.setShadowDarkness sets ShadowDarkness on a light object. It takes id and d.

light.setShadowDarkness(id, d)

function start() {  light.createPoint('point', 0, 2, 0);  light.setShadowDarkness('point', 1);}

light.createPoint is there to give the call something to act on; light.setShadowDarkness is the line that matters. The code sits in start(), which the engine calls once, when the entity spawns.