I got so excited about this Ganzfeld effect so I tried it for 30 mins just awhile ago!
The ghetto mask, a a4 paper sheet on my face and a white grow light above. lying on a carpet on the floor. Got some interesting results! After awhile the sheet turned to a smooth surface and it felt in a way the same as dark room practice. I was seeing for brief moments weird shapes, like viewing them from far away. At one point it felt like I was lying on a beach and I saw the treetops above me. After I got up I saw my carpet in real good fascinating detail, that was cool!
Good warmup for my dark room practice in couple hours
Probably not a good idea to do it in the evening, blasting eyes with bright light