Due to internal file changes this is deprecated.
please look at
https://mods.factorio.com/mod/LargerLamps-2_0

Original Credits to Deadlock https://mods.factorio.com/mod/DeadlockLargerLamp
And Special Thanks to Masterbuilder for some insight in .Lua

2x2 lamps which cast a wide, soft glow, lighting a much bigger area than vanilla lamps. They line up with rails and large power poles.

An electric lamp, fully signal compatible.
A dimmer electric floor panel which can be walked over but has no circuit network connection.
A burner lamp which uses solid fuel (4 MJ per game day, i.e. a lump of coal lasts nearly 7 realtime minutes).

The 2x2 "burner lamp" is unlocked at game start. The electric lamps are unlocked with Optics.

These lamps use an increased "light search radius". It has been tuned to have minimal impact on performance but still, this mod is not recommended for machines which already struggle to render Factorio.