Shines like phosphorescence in a bay
Else clues• Emulates a firefly
• Gets red
• Has the look of love
• Incandesces
• Is affected by black light, perhaps
• Is brilliant
• Is candescent
• Is positively elated
• Is visibly elated
• Like a certain worm
• Luminesces
• Radiates soft light
• Shimmers
• Shines
• What Rudolph's nose does
• Word in Rudolph the Red-Nosed Reindeer