Not an argument, I'm no green thumb and haven't invested much into the plastic container/zip lock bag method myself - mainly sticking to seedling pots and soil.
But like I said, commercial botanical labs have the full heat/cool/light/no light thing happening - I was sent there to repair a germination cabinet years ago-, and they were growing native plant species etc at kings park botanical gardens in perth, not vege, herbs or chillies.
Darkness is better than incandescent we all agree, but technology has moved on.
edit:
Are you measuring the air temp or the soil temp. All you really need for germination in my opinion is moisture and proper temps. The paper towel method is usually quite foolproof as long as you don't over water and keep a proper temp
Sorry for letting this go, but I was happy to see this thread disappear into the ether at the time of your post until discussion got into the article that trippa dredged up.
I'm using a peltier fridge that heats and cools, if anything is in there long enough, soil temp = air temp as it's a sealed system. Yes I did test with my thermometers, soil temp is the same as what I have set the thermostat for air temp to.
It also helps to be clean with the baggie/paper towel method.
Wash your hands before you start and use a clean surface.
Hands are washed and not even involved, it's a bugger to handle wet seeds, so tweezers used anyway.