I was wondering if this could work? I’ve got 2 30W uvc tubes but can’t find 900 ml batten fixings anywhere. 30w ballasts aren’t easy to find either and are expensive, probably because everything is being replaced with Led. Now I know you should always match the ballast with the tube But (the word that means disregard everything I’ve just said) I’ve been rummaging around my attic and have come across a 70w ballast and T8 connectors , the output of this ballast is about twice the voltage that each of the individual tubes require at the correct current. So my question is : Could I run these tubes in series off the single ballast, my assumption is the potential drop should be equal across the two resulting in both lamps being driven at the correct power. Or will the second lamp not strike so break the circuit? I am overdriving them at the moment but concerned it’s going to dramatically shorten the life of the tubes and worried it may cause them to produce some shorter wave radiation leading to production of ozone, the tubes are doped as far as I can tell but thinking the overdrive may damage or just overrun the protection built in at manufacture. Yes I’m making a uv sanitiser, I’d buy one off eBay but they’re most likely to be counterfeit blue lamps.