Indicators are dim..!

Hi folks,

I've recently changed my front indicators from stock to aftermarket, (bulb not led); and noted thy they're not very bright at all. I've tried swapping indicators with other aftermarket ones, swapping the relay and the bulbs but they're still not very bright!
It's as if there's not enough current going to them. Anyone else experienced this problem? Don't have the standard indicators anymore so can't check if they'd work correctly...

Any help/advice appreciated...

Thanks,