A cheap, effective, industrial way to light your tunnels and mineshafts!
Either: Charge Redstone Torches in a BatBox or the like.
Or: Compress Redstone and make more than just one (uncharged) Electric Torch from each Compressed Redstone (Craft these with sticks just like normal torches).
The electric torches should maybe give off a light level of 13 (assuming this isn't enough to burn mobs; that's 15, right?). And while they should take maybe 50EU to charge, they should last infinitely.
Alternatively, they could be recharged by right-clicking with a charged battery, but I can imagine the average IndustrialCrafter not wanting to have to go to such hassle.
Again, if Electric Torches are not to last infinitely, they could be kept charged through some kind of wireless charger (a machine).
R = Redstone
RT = Redstone Torch
CR = Compressed Redstone
S = Stick
ET = Electric Torch
et = Electric Torch (Uncharged)
RT ----50EU---> ET
R -----Compressor---> CR
S -----> et
et ----50EU---> ET
Wireless Box Charger Thing (WBCT):
BB = BatBox
DR = Dynamite Remote
M = Machine
C = Copper Cable
C DR C
C M C -------> WBCT
C BB C