Im having a hard time finding a controller, but I have found one:
https://www.mouser.com/search/Product...-ZXLD1101ET5TA
Not exactly a boost converter, rather a constant current source with a limit. According to the datasheet, only one resistor needs to be changed to change LED current. The data sheet shows up to 6 can be connected in series with each other, but I'll only be hooking up 3 in series, with 5 banks in parallel. Max Output Current in .5A, which is more than enough.
I wanted to design something from scratch to prove to myself Ive moved up to a next level and can design a SMPS from scratch, but I guess this is OK too... The only other thing that worries me is what if this isnt bright enough for a flashlight application? And Technically, I dont need SMD...Id rather have the challenge of Through hole
ADD: I found the same one but with a lower Supply Voltage
https://www.mouser.com/search/Product...22-ZXSC400E6TA