ACD - Austronesian Comparative Dictionary Online

*binaR flash of light

WMP
Dairi-Pakpak Batak	em-binar	to rise, of the moon
	binar	light, radiance
Karo Batak	binar	sparks produced by striking a fire, or in smithing
OC
Lau	bina-bina	a flash of lightning flashing; reflected light; to flash with a glass

Also Manggarai bilar ‘to flash, of lightning, to illuminate’. With root *-NaR ‘ray of light’.