I've got one I made and use
I have tried a couple of light sources. I fitted mine with an inexpensive outdoor light socket that holds two bulbs. I first tried 2-12 V incandescent bulbs from a RV shop and plugged into my vehicle's power outlet. broke one of the bulbs and didn't like the light so I then tried a small round LED push on light ; not enough light. I have a low cost 120V inverter I can plug into the hot power outlet in my T&C. I tried it with two 40W appliance bulbs last week and it works out pretty well. I have power W/I 150' of where I score and use my computer so I ran cords to the clubhouse. I liked the two 40 W bulbs pretty good. I find that less is more with regard to the light. I helped score @ last year's IR 50/50 Nationals and I must say, the light box setup Fairchance has is the best I have seen. Two lighted boxes with a lighted magnifier on a boom between the two boxes. Not many cards were protested, as I recall.
Pete