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Bases types are E27, B22d, E14, E40 and E26
E means Screw type
B means Pin type
Example E22 = Screw type and "22" is the diameter of the screw body cross
section
Example B22 = pin type and "22" means the diameter of the base cross section
Example B22d, the "d" means "2 touching points" in the base
Lamp tube styles
can be "U" shape 2U or 3U or 4U
Example 2U means 2 U
Fully Helical
shape: all the bulb is helical form
Half-Helical shape: half of the lamp is straight and half is helical
(k) is color temperature
if the color temperature is high, means the light is more blue
if the color temperature is low, means the light is more warm
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