Try 12 volt SES bulbs, rather than E14 and loads of results. Main problem is price
firms like specialise in 12 - 24 lighting for caravans and boats, in both cases it is important to get as many lumens per watt as you can, as batteries only charged when engine running, so 2.6 watt and 300 lumen, also voltage range is 10 - 30 volt, and this costs.
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