What is the meaning of 광?

lunatic; nutcase

place of storage; granary

light

luster, sheen

Any of the five highest ranked playing cards in a hwatu deck, marked with the character 光 in most Korean decks.

光: light

廣: breadth

鑛: mine

狂: madness

珖: jade flute

洸: sparkle

匡: to set right

曠: brightness

壙: tomb

胱: bladder

筐: basket

侊: feast

炚: hot sun

Source: wiktionary.org