To the best of my knowledge, I think this variant is new (Please don't hesitate to correct me if I am wrong), and I would like to know your comments and feedback regarding the puzzle, and if you find it enjoyable in order to create more puzzles with this variant.
Rules:
Normal sudoku rules apply.
Digits along a between line must be strictly between the digits in the bulbs on the ends of the line.
The product of the digits along a between line must be the two-digit number represented by the digits in the bulbs. For example, if the two bulbs contain 2 and 5, the product of the digits along the line must be either 25 or 52.
Digits along a line may repeat, as long as they follow all other sudoku rules.
Digit must strictly increase along the thermo starting from the bulb.
The puzzle should be approachable with average difficulty.
f-puzzle link
Solution code: Row 8 followed by Row 9, (18 digits with no spaces, e.g. 123456789987654321)