The title says it all. This is a round-up of 40+ free photoshop abstract light effect fractal brushes.
Reproducing the glow effects shown in the brushes below can be achieved by adjusting the Layer Styles in Photoshop such as Outer Glow.

1. Neutron Collapse Brushset HQ

2. Ecol Brush Set

3. Radial Brushes

4. Christmas Brushes

5. Anigraphuse Flowers Brushes

6. Anigraphuse Curves Brushes

7. Abstract Light Free Photoshop Brushes Vol.1

8. Winter Breeze

9. Abstract Brushes Vol5

10. Abstract Brushes Vol 3

11. Abstract Brushset XIV

12. Descent Brushes

13. CS4 Brushes

14. Sui generis 2

15. Abstract Brushset XI

16. Abstract Brushset VII

17. Party Brushes

18. Enigma Brushes

19. Glow Brushes Part I

20. Abstract Brushset XIII

21. Line Brushes

22. Sharp Abstract

23. Abstract Brushset III

24. Psionic Storm

25. Sui generis 2

26. Sui generis 3

27. CS4 V2 Brush

28. Quantum Brushes

29. Abstract Brushset XV

30. Extremely

31. Abstract Brushes Vol 2

32. Sui Generis

33. Abstract XI

34. Explosion Brush

35. Genisis Brushes

36. Fractal Chaos

37. Abstract VOL 7

38Crystalline Brushes

39. Fractal

40. Mystcart Brushset IV

41. Galactic Brushes

42. Circle Abstract

43. Fractal

44. Fractal Set 1