Our IL200.552 magnetic 150 watt transformer is compatible with all Integral Lighting Xenon and LED fixtures. Low voltage (12 volt) magnetic transformers do not output a standard 12 volts. They output a fraction (typically 10%) of your power input. To maximize the life of either your bulb or LED, be sure to confirm the output power with a digital volt meter. To calculate the proper size required for your installation, simply multiply the quantity of fixtures by the wattage.