Those modeling lights are wicked bright.
The trick will be finding something the right shape that has anything close to the same output.
Also remember that it must be dimmable if you are going to use the proportional setting.
Or if you want to settle for a constant brightness. Any Edison base bulb that will fit should do.
First stop would be a big box store with lots of LED bulbs.
Then maybe BHPhoto for more specialized bulbs.
All the Best,