A 24-karat gold crystal chandelier on sale for $1,099? How about a gorgeous 24-karat design for $999 and with a lifetime guarantee? These are among the bright ideas at Lights On Design, which has illuminated the Main Street Lofts in Yonkers and the Trump Park Residences in Shrub Oak. Its three showrooms shine with recessed lighting, under-cabinet lighting, chandeliers, floor lamps, table lights, and fans. In-home consultations, installations, and repairs are available. Forget finding better deals online: Lights On Design promises to beat all Internet prices.