An LED (light emitting diode) lamp includes a lamp body, a cap mounted on an end of the lamp body, a lamp holder mounted on an opposite end of the lamp body, and a plurality of fasteners. The lamp body includes two beams located at two opposite lateral sides thereof and a plurality of separated light emitting modules mounted on the beams side by side. Each of the fasteners extends through the lamp body, the light emitting modules and the cap in series to secure the lamp body, the light emitting modules, and the cap together.