You don't need any light to germinate seeds, you do need the soil heated up, the light is needed AFTER the seeds have germinated.
Around here, CP (cow poop) is prefered to HP (horse poop) and is considered the better choise of the two.
A LOT of turkeys are grown here, and i prefer TP to all others. There are NO weed seeds in their feed, because they are fed ground feed, and the bedding is kiln dried sawdust.
After having said that, i'd take all i could get of ANY kind of poop! AND i do! Here's a pictorial i made up when i was building up a new garden spot.
I got started by moving some manure and some composted hay/manure mix to my garden spot from my neighbors feed lot.... Now, this is the REAL DEAL here!!
I did put a couple bucket loads of that "real deal" on top of the sand in the tator patch, and then i started hauling the "composted" manure/hay mix to the rest of the garden spot!!
I knew this guy was trouble right off, and there's NO WAY i'd get off my tractor when he was around!!
He would charge my tractor and bang his head on the bucket, trying to push the tractor backwards!!! He did it over and over!!! When i'd steer off to the side, he run in front of the tractor, and charge it again and again!!
Finally, after i pushed him backwards at least a hundred feet!! He turned and ran, kicking his heels high in the air, like he won or something... LOL LOL.... SO, i then got back to hauling compost!!
Untill i had my garden spot FULL of "black gold!!"
Next, i will be rotavateing it in!
I hope you enjoyed the picts!!
DM