Use the switch kit on an old SL-20 and now it works fine - recharging the unit and activating the switch to illuminate 20,0000 candle power of bright white light
Pros: The Switch Kit does work in the original 1st generation light units
Cons: need specific tools and fingere dexterity to do the repairs with the swictch kit
This review was written in the old system and had content requirements that are different than reviews written today.