I put a pan over the one floodlight we have out there (as you suggested); I believe it’s 60w. Not sure how much more to do. Can’t imagine getting too many more fruits, but there are a number of blooms. I might put a little more straw around the back of the enclosure and maybe a little more at the sides. I’m sort of surprised [but very happy, cuz they are so pretty] at how well they are doing; all exposed tomatoes in our area have now succumbed to the frosts.
You can chop off the limbs that have flowers, and stick them in water or dirt, and roots will form at each of the nubs that are covered. Pick off excess leaves, keep at least 4 or 5 maybe more.
Then you can put them in a pot, and hand fertilize. I have grown tomatoes indoors this way several times.
I laid in a stock of incandescent bulbs a while back. Mostly 60’s, but I got in some 100w too. Figure in a few years I can sell them on the “black market” to back yard farmers. :)