darkness for 48 hours before harvest? does it effect anything?

i've heard it makes the bud more potent, does anyone do this?

This is debateable. I did see an article that claimed some plants can gain up to 30% more potency because of the plant pushing out more resin. Some also claim no difference. I have done both ways and I beleive that it does make the trichs mature even more and I do it on all harvests now.

From my own experience I'd say no, and I haven't seen anything that's convinced me to try it again.

damnit another 50/50 lol it's always 50/50

I do it everytime. I read an article that said it increases potency and trichome production. Also i think it gives a better taste because at night the hormones and nutrients go to the roots so it is kinda like an extra flush. If im growing indica and a sativa i just take out a few plants and put em in the closet then harvest them and put more in the closet.

I chop first thing in the morning, before it's exposed to hps.