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How does the current affect the brightness of the bulb?

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The brightness of a bulb is controlled by the current flowing through it. Different devices utilize various methods to adjust the current and consequently the brightness of the bulb. For instance, a lamp current control device employs a pulse width modulation IC to regulate the current and maintain the desired brightness . In contrast, a circuit for high-low flashing in a light string circuit uses a resistive element and a bi-metallic thermal switching element to control the current passing through the bulb filament, alternating between low and high brightness states . Additionally, a brightness adjustable LED bulb incorporates a control device that adjusts the width of PWM signals sent to the LEDs based on the switch status, enabling dimming of the LEDs by modifying the current flow .

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Patent Dual brightness twinkle in a miniature light bulb John L. Janning 03 Nov 2009	The current passing through a resistive element and bi-metallic thermal switching element controls the brightness of the bulb by switching between high and low states in a series-wired light string circuit.
Patent Device and method for controlling brightness of bulb Shao Wenqi 01 Jun 2016 2 Citations	The brightness of the bulb is controlled by adjusting the duty ratio of driving pulses based on the detected light strength, not directly influenced by the current.
Patent Lamp current control device Cheng-Chia Hsu 14 Sep 2005 5 Citations	The lamp current control device adjusts the pulse width output of the electronic power switch based on current feedback, regulating and maintaining the brightness of the lamp accordingly.
Patent Brightness adjustable LED bulb Lichun Lai 11 Aug 2010 1 Citations	The brightness of the LED bulb is controlled by adjusting the width of PWM signals sent to the LEDs, which is regulated by the control device in response to the alternating current.
Patent Current control circuit with limiter, temperature control circuit, and brightness control circuit Nobukazu Yoshizawa 22 Feb 2006 1 Citations	The current control circuit with limiter regulates the current to control the brightness of the bulb, ensuring stable and adjustable illumination levels based on the circuit's design.

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