The biggest factors in pinning are Temperature, humidity and FAE (fresh air exchange)

If your temp is too high they won't fruit / pin! if you want to kick start a flush, put in the fridge for 24 hours prior! mushrooms fruit when the temperature drops, so beware of your fruiting chamber getting to warm.

For PF tek humidity should be 97% and above

For trays and bulk grows humidity should be about 90%

The more FAE the better just make sure it doesn't dry out, you could induce FAE with a coolmist humidifier pumped right in then you have the FAE and the humidity perfect!

Light is not that important, mushrooms do not photosynthesize. Floresnt light or standard indoor incandescent light will be fine.

My friend has grown many bloomers in her past and thought she would pass on this knowledge.

Hope it helps

Peace