Meaning: The fireflies' lights make everyone happy.
Choice of Words: Flashing lights: lights that blink or shine brightly, bring joy: make someone happy.
Alternative Expressions
Twinkling lights make everyone happy.
Meaning: This means that everyone feels good when they see twinkling lights.
Choice of Words: "Twinkling" describes lights that are shining with a gentle, sparkling light, like stars. "Make" means to cause something to happen. "Happy" is a feeling of joy and contentment.
Bright lights give happiness to everyone.
Meaning: This means that everyone is happy when they see bright lights.
Choice of Words: "Bright" describes lights that are very strong and can be easily seen. "Give" means to provide something. "Happiness" is a state of well-being and contentment.