Just a little concerned about what you said there, although I don't know exactly what you mean.

Most Light machines out there have goggles with red LEDs and the intensity is usualy set too high. The problem with this combination is that the color red stimulates the brain instead of relaxing it, so your mind gets altered but not relaxed. Bright light intensity can actualy overstimulate the visual cortex so you can end up with a headache.

Try turning the light intensity as low as you can until it's almost perceptible. If your machine came with red LED goggles then try to get white LED goggles.

Cheers!