You can get around the lack of direct word/concept translation by thinking about sparks and smoldering. sparks can be related to lightning, smolder related to fire, small, humble (not a big fire, no smoke). However, to get a better translation, we need the phrase you're trying to say, THEN we can get a better translation than just "mal qo" (small lightning) and "mal, bonaar yol/yolos voth nid agtaas su" (small, humble fire/flame with no burning air")