I'm a newbee to all this. I also added a illuminator to brighten a dark area. It did but the illuminator had a flashlight beam not wide. I did research and found I needed to add something to diffuse or spread out the light.
I doubt this would work, haven't bought any to try it yet. But if I took a piece of the clear wax paper, wadded it up to make allot of different angled surfaces, then taped it on the illuminator. Do you think this would work? Being wadded up it would diffuse the light but would enough light shine thru the paper?
Here's a diffuser for a flash on a camera, may work
http://www.ebay.com/itm/White-Flash-Diffuser-Cap-Box-for-CANON-Speedlite-Flashgun-580EX-580EX-II-/321387365519?pt=LH_DefaultDomain_0&hash=item4ad42e048f
Or maybe this, its a camera diffuser lens
http://www.ebay.com/itm/Kenco-T-975-Diffuser-Lens-for-900-Series-Movie-Video-hot-Lights-USED-V615-/350787203201?pt=LH_DefaultDomain_0&hash=item51ac8bf081