I found this
bhel-1
To shine, flash, burn; shining white and various bright colors.
▲ Derivatives include blue, bleach, blind, blond, blanket, black, flagrant, flame.
I. Suffixed full-grade form *bhel-o-.
1. a. beluga from Russian belyĭ, white; b. Beltane from Scottish Gaelic bealltainn, from Old Irish beltaine, "fire of Bel" (ten, tene, fire; see tep-) , from Bel, name of a pagan Irish deity akin to the Gaulish divine name Belenos, from Celtic *bel-o-.
2. phalarope from Greek phalaros, having a white spot.
3. phalaenopsis from Greek phallaina, moth (< *"white creature").
II. Extended root *bhleə1-, contracted to *bhlē-.
1. Suffixed form *bhlē-wo-. blue from Old French bleu, blue, from Germanic *blēwaz, blue.
2. Suffixed zero-grade form *bhl̥ə-wo-. flavescent, flavo-; flavin, flavone, flavoprotein from Latin flāvus, golden or reddish yellow.
III. Various extended Germanic forms.
1. bleach from Old English blǣcan, to bleach, from Germanic *blaikjan, to make white.
2. bleak1 from Old Norse bleikr, shining, white, from Germanic *blaikaz, shining, white.
Is related,maybe