https://gist.github.com/collwee/ea41a38b78e3c41a21f2273e547dfb07

i don't have a crashlog my minecraft was frozen
around the moment below until the end of the log above where i have killed minecraft
whit the task manager

[08:41:56] [ic2-poolthread-3/WARN] [ic2.EnergyNet]: Tile de.keridos.floodlights.tileentity.TileEntityElectricFloodlight@65f874e (dim 500: -1515/163/-1521) removal without registration
[08:41:57] [ic2-poolthread-5/WARN] [ic2.EnergyNet]: Tile de.keridos.floodlights.tileentity.TileEntityElectricFloodlight@65f874e (dim 500: -1515/163/-1521), sub tile de.keridos.floodlights.tileentity.TileEntityElectricFloodlight@65f874e (dim 500: -1515/163/-1521) addition is conflicting with a previous registration at the same location: de.keridos.floodlights.tileentity.TileEntityElectricFloodlight@50dd28cf.

Are you sure this lag is caused by FloodLights?
The logs you're referring to:

[08:41:56] [ic2-poolthread-3/WARN] [ic2.EnergyNet]: Tile de.keridos.floodlights.tileentity.TileEntityElectricFloodlight@65f874e (dim 500: -1515/163/-1521) removal without registration
[08:41:57] [ic2-poolthread-5/WARN] [ic2.EnergyNet]: Tile de.keridos.floodlights.tileentity.TileEntityElectricFloodlight@65f874e (dim 500: -1515/163/-1521), sub tile de.keridos.floodlights.tileentity.TileEntityElectricFloodlight@65f874e (dim 500: -1515/163/-1521) addition is conflicting with a previous registration at the same location: de.keridos.floodlights.tileentity.TileEntityElectricFloodlight@50dd28cf.

are just minor warnings and I don't believe they are responsible for the lag. There are lots of exceptions related to saving world data though and that would be my guess.

Try to start the game without FloodLights and if the lag persists, this mod didn't cause it. Otherwise provide necessary information that will help to reproduce the bug:

• Version of:
  • FloodLights
  • Forge
  • other mods you think may interfere with FloodLights
• More detailed description of the problem and steps to reproduce it
• Additional game/crash logs in addition to those you already provided (if you have any)