According to Osho, experiences of light, peace, and bliss are auspicious first glimpses - not samadhi itself. They signal spring's approach, but final samadhi arrives only when every experience dissolves: neither light, nor peace, nor bliss remains - only bare awareness. Maturity means even bliss is unnoticed, like health after illness. Enjoy the signs, but don't cling; continue deepening.
Seeing light or feeling peace in meditation is a good start, but real samadhi is when all experiences fade and only quiet knowing remains.