A LED light source, comprising one or more LED light source arrangements, wherein each of said LED light source arrangements comprises: a plurality of LED members, wherein said LED members have a first light emitting surface and an opposed second light emitting surface, wherein said LED members are adapted for providing illumination through electroluminescence at both said first and second light emitting surfaces (11, 12); two fluorescent members (20, 30) on top of said first and second light emitting surfaces (11, 12) of said LED members respectively to retain said LED members in position such that the illumination generated from both said first and second light emitting surfaces (11, 12) of said LED members is capable of passing through said two fluorescent members (20, 30) from said first and second light emitting surfaces (11, 12) respectively; an electrode member electrically coupled with said LED members for electrically connecting said LED members electrically connecting said LED member to a power source; and characterized by a retention member coupled with said two fluorescent members (20, 30) to retain said fluorescent members (20, 30) in position to define a LED receiving cavity between said inner surfaces of said fluorescent members (20, 30) so as to receive said LED members within said LED receiving cavity, wherein said retention member has a plurality of passage openings between said two fluorescent members (20, 30) for said LED members to communicate with an external environment outside said LED receiving cavity, wherein said two fluorescent members (20, 30) sandwich said LED members in such a manner that said LED members are aligned and positioned orderly between said two fluorescent members (20, 30) to define a heat passage between two opposite sides of two adjacently positioned LED members respectively, wherein said passage openings are spacedly formed along said retention member for allowing heat transfer away from said LED members within said LED receiving cavity through said heat passages and said passage openings. a plurality of LED members, wherein said LED members have a first light emitting surface and an opposed second light emitting surface, wherein said LED members are adapted for providing illumination through electroluminescence at both said first and second light emitting surfaces (11, 12); two fluorescent members (20, 30) on top of said first and second light emitting surfaces (11, 12) of said LED members respectively to retain said LED members in position such that the illumination generated from both said first and second light emitting surfaces (11, 12) of said LED members is capable of passing through said two fluorescent members (20, 30) from said first and second light emitting surfaces (11, 12) respectively; an electrode member electrically coupled with said LED members for electrically connecting said LED members electrically connecting said LED member to a power source; and characterized by a retention member coupled with said two fluorescent members (20, 30) to retain said fluorescent members (20, 30) in position to define a LED receiving cavity between said inner surfaces of said fluorescent members (20, 30) so as to receive said LED members within said LED receiving cavity, wherein said retention member has a plurality of passage openings between said two fluorescent members (20, 30) for said LED members to communicate with an external environment outside said LED receiving cavity, wherein said two fluorescent members (20, 30) sandwich said LED members in such a manner that said LED members are aligned and positioned orderly between said two fluorescent members (20, 30) to define a heat passage between two opposite sides of two adjacently positioned LED members respectively, wherein said passage openings are spacedly formed along said retention member for allowing heat transfer away from said LED members within said LED receiving cavity through said heat passages and said passage openings.