Led lighting device

An LED lighting device, comprising:

• a first portion, wherein a lamp cap is disposed thereof, the lamp cap extends in a first direction;
• a second portion, wherein a case and a power supply are disposed thereof, the power supply is disposed in the case;
• and
• a third portion, wherein a heat exchange unit and a light emission unit are disposed thereof, the light emission unit and the heat exchange unit are connected and form a thermal conduction path, the light emission unit and the power supply are electrically connected, when the first direction is substantially parallel to the horizontal plane, the light emitting unit of the LED lighting device provides downward light emission;
• wherein the first portion, the second portion and the third portion are arranged sequentially along the first direction;
• wherein when the LED lighting device is installed horizontally, the moment of the lamp cap is F=d1*g*W1+(d2+d3)*g*W2, and the moment satisfies the following formula:
• 1 NM<F<2 NM;
• wherein d1 is the distance from the first portion to a plane where the center of the second portion is located, d2 is the length of the second portion, d3 is the distance from the second portion to the plane where the center of the third portion is located, W1 is the weight of the second portion, and W2 is the weight of the third portion.