2 each 2x55 AH kits $120, 4 bulbs $72, wood and varnish to make a
new top $40, shipping $20. $252 for 50 gallons or about 5 bucks a gallon for 4.4 watts per gallon.
I have too much light though. I stager them on and off and only run the full 4.4 for about 3 hours. I bought this much light with the intent of upgrading to a 75 or 90 gallon tank. I have not done it yet though.
I also agree with what others have said. It looks like your poll dollar amounts are too low. I think the mean will be well above your top value of 100. I think 50 dollar increments from 50 to 500 or so might work better.
50g, Eco complete, AH 4x55w, Pressurized co2, Azoo reg and controller, Filstar xp3 filter.