We use LEDs from Diode Dynamics because they're the best ones we've found. They're made in the US to high standards, not just the minimum price. They've got constant-current circuitry to protect the bulbs from transients and offer a three year warranty.
The H3 bulbs are used in 1999-00 fog lights as well as other applications. These are a cool white that's a great visual upgrade from stock, but won't put out significantly more light than a new standard H3. Sold in pairs.