I got a Solarforce Q5 drop in for my 6P. It was rated at 6 volts 225 lumens, not actual though, probably more like 180 lumens. However it is very good at throwing a great beam, flood and it's very bright. I got it because Solarforce claims quality control online at ebay and it works great. There is now an R2 Solarforce drop in rated at 240 lumens at 6 volts. Hope this helps.