Mercury vapor lamp ballasts are similar to the ballasts used with fluorescent lamps. LEDs are highly efficient at producing colored light compared with incandescent lamps and filters. HID burners give higher efficacy than halogen lamps. They have much higher efficiency than incandescent lamps. CFLs radiate a spectral power distribution that is different from that of incandescent lamps. Early LED lamps varied greatly in chromaticity from the incandescent lamps they were replacing. Aluminium oxide is also used in preparation of coating suspensions in compact fluorescent lamps. Cerium is also an essential component of phosphors used in TV screens and fluorescent lamps. LEDs are also less fragile than glass lamps. This is a method analogous to the way fluorescent lamps work. Some people have concerns about the health effects of fluorescent lamps. The first primary product was kerosene for lamps and heaters. It was instead used for some kerosene lamps and stoves. The headlamp bezels were more of a squircle shape with rectangular front parking lamps. Smaller circular front parking lamps were mounted in those extensions.