Can a MBP 15'' early 2011 run DDR3L ram?
Yes, you can. Please take a look at this link from Crucial, which states that the MacBook Pro (15-inch, Early 2011) can run:

Memory Type: DDR3 PC3-10600, DDR3 (non-ECC)
Maximum Memory: 16GB
Slots: 2


The website even provides you with the recommended RAM for your computer. Look at the picture below.