yes,
they have a 10mm mcpcb you can fit in your olight… the 16mm wont fit (if your S1 is the same internal diameter as my S Mini)
here is a photo albumb of an olight mod I did to 219b Ti SMini album - Album on Imgur
I buy spare 12mm mcpcb, onto which I install 219b and 519a myself. It lets me choose LEDs I like best
here is another light that I removed an XM-L2 and installed a Nichia 519a, there are photos of all the different softgoods and hardware I used to do the mod:
yes, you can mod an olight, the hard part is getting the bezel off, and back on, you can use the stock Tir, and if the beam is less than acceptable, you can upgrade to a 17mm pebbled Tir for XM size LEDs Page Not Found - Aliexpress.com it works with Nichia also, as there is no 17mm option for nichia size
this thread shows both optics on my S Mini
good luck w your mod… will be happy to help answer questions