I bought two "off-road only" H4 bulbs at a local 4x4 truck place that are 80/100watt bulbs. I put in four new white fuses in the 560SEC and made sure all connections were fine since I'd be drawing much more current. Work great, been in there about five years. LOTS of light now. The 4x4 truck guys probably have the 55/65 watt bulbs but I never checked.

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There is a very fine line between "hobby" and "mental illness."
FrankenBenz: '87 560SEC with an '02 cammed LS6 and custom 4L60E.
Bling: '87 560SEC, ported/polished, lowered
Lisa: '87 560SEL, lowered