Across
- 2. bright
- 4. red
- 5. light
- 6. heat
- 9. theoretical
- 10. spectrum
- 13. electromagnetic
- 14. short and high
- 16. light & radiaton
- 17. cycles
- 19. light
Down
- 1. chart
- 3. change
- 7. blue
- 8. long and low
- 11. kitchen appliance
- 12. distance
- 15. medical
- 18. sun