PWM Modules: XTR (H11) Quantity:Pair Heavy-duty aluminum housing and UV-resistant

Heavy-duty aluminum housing and UV-resistant polycarbonate lens

If your XB ballasts have stainless steel brackets / tech info on the back

generating enough heat to prevent ice build-up

These LED bulbs: will replace any T20 based 3156/3157 series bulb

If yours have a black plastic lens frame similar to the one shown in the product pictures

PWM Modules: XTR (H11) Quantity:Pair Heavy-duty aluminum housing and UV-resistantXenonDepot PWM HID Fix: The magic little box that you've been looking for if you're installing an HID kit or LED kit in a vehicle equipped with PWM (pulse width modulation) headlight technology. What is PWM? Newer vehicles use PWM technology to increase bulb life and reduce fuel consumption by sending a pulse of alternating voltages to the headlight bulb, as opposed to a stable 12V. Factory installed incandescent or halogen bulbs can handle this pulse