The next release of Electrum will support 'Submarine Payments', where you pay to an on-chain address using your lightning funds.
Discussion
Cool but... That's a high fee for Bitcoin-to-Bitcoin. Handy though.
It's trustless right? I guess the swap provider partially signs a transaction that requires the same pre-image that the Lightning payment depends on?
Although, I'm not sure about confirmations - we need to ensure the Lightning payment is held back until there have been a few confirmations?
it is waiting for one confirmation before revealing the preimage