I just ordered a couple of outdoor flood lights from Aliexpress. They are 50w led lights and are suppose to put out 4500 lumens. I plan on using them instead of a 500w halogen light. A 500 w halogen light puts out about twice as many lumens, but the eye sensitivity is a log function so the led lights will seem almost as bright.
The lamps I ordered are intended for non portable installations so I will have to put on a electric cord. And they are not super efficacy. They are 50 watt lamps and put out 4500 lumens so do not break any records for lumens per watt. But do win on cost . About $ 3.60 each delivered.
If you search for them , look for " flood light 110v " A lot of the flood lamps from China are for 220 volts.
I bought mine from " Shop 5389360 store ".
Dan