There are a lot of choices when it comes to the beds, but there are legal requirements on the strengths, radiation levels, hygiene, and electrical installation as well as ventilation and safety cut off's.
I find the beds with a separate dedicated facial tanner great as they contain equal parts blue and red bulbs (red for collagen stimulation), although you may want to consider ones that have three sectional control where the client can tan just legs, just top half, just face or any combination.
As a daily sunbed user, I know the importance of skin care so definitely invest in a great range of tan lotions as well as moisturisers and possibly self tanners/ gradual tanners for aftercare retail xoxo