Product Overview One Sealed Beam 4040HD This is a 12.8 Volt Heavy Duty bulb with a Slip-On terminals. It is a common replacement for the 4000 sealed beam; it has the same voltage and wattage, the same light output and beam pattern, and it is the same size. The only difference is the additional ceramic filament support that makes this a heavy duty bulb. Please review the images for details. For additional specifications, please review the item specifics. Reviews (No reviews yet) Write a Review