I have wired a Basta 6V/2,4W generator light like this and used it for several months now. I'm using rechargeable AAs with 1,2V nominal voltage, so I have 6 of them. The battery package delivers more than the recommended +20% overvolting when freshly charged, but so far the bulb has taken it OK. The Oval Plus standlight feature shouldn't be a huge issue.
--J