Wow, too dark to see anything. Can you post a render of it from Poser perhaps? :) guess it's mostly enclosed so not much sunlight getting in?

Ok,assuming it's an indoor arena
I'd suggest you make a quadratic spot light
put this above the arena floor, up near the ceiling.
you want it to be a very wide, soft spot light, throwing light as if from light in ceiling or whatever.
try something like this:

Colour: a light tan (torch light isn't white light, assuming you want it to look torch lit, sunlight ha sit's own colour by the way, it isn't pure white, iirc)
Softness 4.00 (if want more realism, but it does increase render times)
Spread: 65
Falloff 100 (so no hard edges to where the spot is)
Power: depends on scene
Edit the light, shadows to be 85% shadow density

if you don't mind longer ender times, adding a ligh gel can improve realism, if you want it to look like torch light.

Here i've made a simple arena, lit as suggested. :)

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