After discussing with my Dentist, I went with ACP bleaching trays for three reasons.
1) You have the option of Day or Night bleaching at home.
2) You can bleach as often as you would like.
3) With light systems, you need to sit in the dentist chair for a couple of hours and is more expensive. However, if you want an immediate change go with one of the light systems.
https://www.discusdentalstore.com/pr...D=38&coreID=29
That's my opinion anyway. Good luck