Sorry, no online dictionaries contain the exact phrase constant brightness.
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Reverse dictionary results:
1. variable
2. photon
3. aad
4. ache
5. alternate
6. coherent
7. equable
8. heliostat
9. law
10. photoperiod
11. roundabout
12. sad
13. sas
14. steadfast
15. stream
16. unrelenting
17. attrition
18. blaze
19. blazed
20. dull
21. eclipse
22. glare
23. gleam
24. gleaming
25. glories
26. glory
27. glow
28. lumen
29. lustre
30. pale
31. pales
32. photoflood
33. radiance
34. scintillation
35. shine
36. shining
37. twinkle
38. brightness constancy
39. chrominance
40. beam

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