Light emitting diode lamp

1. A light emitting diode (LED) lamp, comprising:

a lamp base, the lamp base defining a plurality of openings; and

a plurality of illumination modules located on the lamp base and corresponding to the plurality of openings, each of the plurality of illumination modules comprising:

a plurality of lamp holders separately located on at least one sidewall of the plurality of openings; and

a plurality of illumination units held by the plurality of lamp holders and apart from each other, each of the plurality of illumination units comprising:

a hollow heat dissipating assembly;

at least one lighting assembly contacting the hollow heat dissipating assembly whereby heat generated by the at least one lighting assembly is absorbed by the hollow heat dissipating assembly;

two connection units connected to the two opposite terminals of the hollow heat dissipating assembly; and

at least one printed circuit board electrically connected to the at least one lighting assembly, wherein the at least one printed circuit board controls a power supply through the plurality of lamp holders and at least one of the two connection units to the at least one lighting assembly.

2. The LED lamp of claim 1 , further comprising a plurality of first power cords electrically connected to the plurality of illumination units.

3. The LED lamp of claim 2 , wherein the lamp base further defines a plurality of wire chutes located at least one of the two terminals of the plurality of illumination modules to store the plurality of first power cords.

4. The LED lamp of claim 3 , wherein some of the plurality of first power cords connected to one of the two terminals of the illumination modules are electrically connected to a current with a first polarity, and other of the plurality of first power cords connected to the opposite terminals of the illumination modules are electrically connected to a current with a different polarity.

5. The LED lamp of claim 3 , wherein all the plurality of first power cords are connected to one of the two terminals of the illumination modules, and are electrically connected to currents with different polarities.

6. The LED lamp of claim 3 , wherein each of the plurality of illumination modules further comprises a plurality of mounting plates respectively covering the plurality of wire chutes and the plurality of lamp holders.

7. The LED lamp of claim 6 , wherein the LED lamp further defines a plurality of drainage pipelines between the plurality of mounting plates and the plurality of wire chutes to drain water from the LED lamp.

8. The LED lamp of claim 6 , wherein each of the plurality of mounting plates further includes an end wall adjacent the plurality of illumination units.

9. The LED lamp of claim 8 , wherein each of the plurality of end walls defines a plurality of depressions to hold the plurality of illumination units respectively.

10. The LED lamp of claim 1 , wherein each of the two connection units comprises a cover, a seal piece, and a lamp plug.

11. The LED lamp of claim 10 , wherein each of the plurality of illumination units comprises a lamp module, and the lamp module comprises the hollow heat dissipating assembly and the at least one lighting assembly.

12. The LED lamp of claim 11 , wherein the cover comprises:

a location piece inserted into the lamp module;

a stair portion located on an outer side of the cover opposite to the at least one lighting assembly;

a threaded neck substantially a cylinder extending outwardly from the cover opposite to the at least one lighting assembly; and

a wire hole.

13. The LED lamp of claim 1 , wherein each of the plurality of lamp holders comprises a holding base, a socket, a nut, and a number of seal rings.

14. The LED lamp of claim 13 , wherein one of the plurality of first power cords penetrates the nut, one of the plurality of seal rings, one of the plurality of wire chutes, the holding base, and one of the plurality of seal rings, and inserts into the socket from the left to the right.

15. The LED lamp of claim 13 , wherein the socket comprises two socket clips, and each of the two socket clip defines two hooked fasteners, two sidewalls, two expansion portions to hold two contact pins of the lamp plug, and a weld portion from top to bottom.

16. The LED lamp of claim 13 , wherein the socket comprises two socket holes to fit two contact pins of the lamp plug.

17. The LED lamp of claim 13 , wherein the socket comprises a socket base, a neck portion connected to the socket base, an orientation portion connected to the neck portion, and a threaded portion connected to the orientation portion.

18. The LED lamp of claim 17 , wherein each of the plurality of lamp holders further comprises:

a first spring located between the neck portion and one of the plurality of wire chutes;

a second spring located between the nut and the one of the plurality of wire chutes; and

two pads located on two opposite terminals of the second spring.