A led filament arrangement

A light emitting diode, LED, filament arrangement configured to, in operation, emit LED filament arrangement light, comprising:

• at least one first LED filament configured to, in operation, emit first LED filament light having a first correlated color temperature, CCT1, at least one second LED filament configured to, in operation, emit second LED filament light having a second correlated color temperature, CCT2, wherein CCT2>CCT1, and at least one third LED filament configured to, in operation, emit third LED filament light having a third color temperature, CCT3, wherein CCT3>CCT2;
• wherein each of the at least one first LED filament, the at least one second LED filament and the at least one third LED filament comprises a carrier of elongated shape, wherein a respective plurality of light emitting diodes of the at least one first LED filament, the at least one second LED filament and the at least one third LED filament in arranged on the respective carrier;
• wherein the LED filament arrangement further comprises a control unit configured to control a first luminous flux, L1, of the first LED filament light emitted from the at least one first LED filament, to control a second luminous flux, L2, of the second LED filament light emitted from the at least one second LED filament and to control a third luminous flux, L3, of the third LED filament light emitted from the at least one third LED filament according to at least one predetermined setting in order to control a total correlated color temperature, CCTtot, of the LED filament arrangement light as a function of the at least one predetermined setting;
• wherein the control unit is configured to control a switching of the at least one second LED filament as a function of the first luminous flux, L1, of the first LED filament light emitted from the at least one first LED filament;
• and
• wherein the control unit is configured to control a switching of the at least one third LED filament as a function of the luminous flux, L2, of the second light emitted from the at least one second filament;
• and wherein:
• 450
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• ≥
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• CCT
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• 2
• -
• CCT
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• 1
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• ≥
• 150
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• CCT
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• 3
• -
• CCT
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• ≥
• 1000
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• CCT
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• 3000
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• 1500
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• ≤
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• ≤
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• wherein the control unit is configured to increase the first luminous flux, L1, to a first predetermined threshold, and, subsequently at said first predetermined threshold, switching on the at least one second LED filament and increasing the second luminous flux, L2, to a second predetermined threshold, and, subsequently at said second predetermined threshold, switching on the at least one third LED filament and increasing the third luminous flux, L3, or
• wherein the control unit is configured to increase the first luminous flux, L1, and the second luminous flux, L2, simultaneously;
• wherein the increase in luminous flux of the second LED filament light is higher than the increase in luminous flux of the first LED filament light;
• and wherein the control unit is configured to increase the second luminous flux, L2, to a second predetermined threshold, and, subsequently at said second predetermined threshold, switching on the at least one third LED filament #6 and increasing the third luminous flux, L3.