Mainly over the 2 years I have been working with PandoraStar light entrainment, as well I am about to converge previous neurofeedback with virtual reality and open to collaborations in this area with other early adopters
When budget is not available, classic Dreamachines ( invented in 1960s by Brion Gysin & Ian Sommerville ) are always useful photic entrainment devices and I have about 5 now !