I can guarantee you that whatever LED bulb (downgrade) or high wound bulb (e.g. Philips X-treme vision) you put in there, it won't be a big upgrade. Just remember that you want your lights, a safety device, to be reliable. I've been through this already.
Take the housing apart and retrofit HID bi-xenon (G5-R, Mini D2S) or bi-LED (Koito) projectors. It's the only upgrade worth doing.
Check the DIY section for examples.