ЛУЧ _|_ RAY / LUCH [ɫut͡ɕ]
Hint with an alternative definition: it is like a yellow-blue chip of light or child of light & glow (a visible, narrow, intense), for example, a gleam from a luster, lamp or torch (or any illuminant) who can reach any place
Hints with translation + consonant words (by sounds or letters): loose light of cheer & glitz (metaphorically) / area highlighted by a beam = choose + light
Russian pro-tip: света полоса, линия узкая, меж черноты туч / линия энергии из частиц / как свет из люка / чул’ан (место тёмное без луча) | луч / луны часть / лук + очаг = стрела света
Latin tip: lucerna, lucifico, lux
Mental visualization: Л (lamp) + У (beam of the lamp) + Ч (candlestick)