I think if you wanted lots of light and didn't have much money you would buy low-noise CPU coolers and strap 100W LED arrays to them. You could rack them up side by side and achieve quite a lot.
You can get 100W LED arrays that claim high CRI for $50. Yuji sell perhaps more reliable ones for $100. A reasonable low-noise CPU cooler can be had for under $50. Depending on whether you trust eBay auctions and how good a cooler you want to risk, if you don't want a point source you can therefore build a big LED array, perhaps to drive diffusion, for around $1.50 a watt for the core power components. Making it into a usable tool might take some engineering, but if you're happy with a covered wagon that's not rocket science.