What is the difference between the led bulb lamp E40 lamp holder and the E39 lamp holder?
1, E stands for Edison screw bulb, 39, 40 refers to the nominal diameter of the bulb thread. E39 is the American standard specification, E40 is the European standard specification. Our country also adopts European standard specifications.
2, E39 is less than half of the spiral of E40, the former is 110V, the latter is 220-240V, although there is not much difference in use, but if E39 is used in European countries, the life expectancy is short, it is easy to predict the human body. The hazard, but now the popular E40 LED bulbs do not have this problem with a wide voltage of 100-240V.
3, E39 / E40 caliber is not the same size, one is 39, one is 40, you can also use the bulb for comparison test: You can use an E39 bulb to test; the tighter one is E39 The looser one is the E40; vice versa. It can also be tested with the E40 bulb: the tighter one is the E39, the better is the E40! It can also be distinguished from the certified symbols! The height is remembered to be the height of the E40. A little!
4. E39 and E40 not only have different appearances, E39 usually has connecting lines, but E40 usually connects the wires through threaded binding posts; the two are different standard lamp holders, E40 is American standard, E39 is based on IEC standard system; export, certification, and then mixed.
2, E39 is less than half of the spiral of E40, the former is 110V, the latter is 220-240V, although there is not much difference in use, but if E39 is used in European countries, the life expectancy is short, it is easy to predict the human body. The hazard, but now the popular E40 LED bulbs do not have this problem with a wide voltage of 100-240V.
3, E39 / E40 caliber is not the same size, one is 39, one is 40, you can also use the bulb for comparison test: You can use an E39 bulb to test; the tighter one is E39 The looser one is the E40; vice versa. It can also be tested with the E40 bulb: the tighter one is the E39, the better is the E40! It can also be distinguished from the certified symbols! The height is remembered to be the height of the E40. A little!
4. E39 and E40 not only have different appearances, E39 usually has connecting lines, but E40 usually connects the wires through threaded binding posts; the two are different standard lamp holders, E40 is American standard, E39 is based on IEC standard system; export, certification, and then mixed.
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