I was thinking of getting an LED drop-in for a Maglite 4D of mine and I was wondering what your best experience is with these drop-in modules? I see a million of them out there and on ebay. I'm looking for something in the 3000K-4000K color temperature range (preferably 3400K-3600K). I also would prefer it to be single mode and over 1,000 Lumens. I just want a drop-in that will fit in the standard PR base and is of good quality. Want something simple, bright, and of good light quality with a decent CRI.