LSD is not a "light" psychedelic by any sense of the word. It's pretty great in many ways, but one of the big downsides is the duration of the drug. Mushrooms would be a better first bet, solely because the duration is significantly shorter. "light" is a hard term to use for any psychedelic as most can put you into total, terrifying ego loss. That being said, safe and sane mushrooms are your best bet IMHO. Just read trip reports to get an idea of the proper set and setting to get the most from the experience.