The standard line voltage in North America is 120 Volts (120V). 120V bulbs are designed to be the most efficient at that voltage. 120V bulbs will produce a brighter, whiter light than 130V bulbs. 130V bulbs, however, are more resistant to power surges and will last longer that 120V bulbs. Power surges are more common in rural areas. We stock a variety of 120V and 130V bulbs. Call us at 1-800-542-4483 or come into one of our stores so we can help you find the right bulb for your purpose.