The fourth set of light synonyms is humorous / cheery.  We can often bring light into our lives and that of others through humor.  Adam Sandler knew it well when he wrote his Chanukah song.  A quick Google or YouTube search will turn up a lot of funny and fun videos and songs about this holiday.  Science has shown us that laughter really is the best medicine.  It lowers blood pressure, raises endorphins, increases blood flow, decreases stress, and can even lower blood sugar (something much needed after eating all those latkes and sufganiot – jelly donuts).  So, get out there and laugh a little – it’s good for you!