Lamp beads have a wide range of power, from low-power indicator lights to high-power lighting lamp beads. Different power lamp beads correspond to different current ranges, which mainly depends on the rated voltage of the lamp bead (usually the forward voltage VF) and the relationship between power, voltage and current (P = V * I, where P is power, V is voltage, and I is current).
However, it should be noted that since the rated voltage of the lamp bead may vary depending on the model and manufacturer, the current values given below are only approximate ranges, and the specific values need to be determined according to the actual specifications of the lamp bead.
Common lamp bead power and corresponding current range
1. Ultra-low power (≤0.06W)
- These lamp beads are usually used in indicator lights or small electronic devices.
- Assuming the rated voltage is 2V (the actual value may be different), the current is approximately: I = P/V = 0.06W/2V = 0.03A (i.e. 30mA).
2. Low power (0.06W-0.5W)
- This type of lamp beads are widely used in various indicator lights, decorative lights and small lighting equipment.
- Taking 0.2W as an example, assuming the rated voltage is 3V, the current is roughly: I = P/V = 0.2W/3V ≈ 0.067A (i.e. 67mA).
3. Medium power (0.5W-1W)
- Medium power lamp beads are suitable for occasions that require higher brightness, such as car taillights, traffic lights, etc.
- Taking 0.75W as an example, assuming the rated voltage is 3.2V, the current is roughly: I = P/V = 0.75W/3.2V ≈ 0.23A (i.e. 230mA).
4. High power (1W-5W and above)
- High power lamp beads are mainly used in the lighting field, such as LED bulbs, LED light strips, etc.
- Taking 3W as an example, assuming the rated voltage is 3.3V (note: high-power LED lamp beads usually connect multiple chips in series or use higher voltages, this is just an example), the current of a single chip may be lower, but the total current of the entire lamp bead (which may contain multiple chips) will be higher. If calculated based on a single chip 3.3V, the current is roughly: I = P/V = 3W/3.3V ≈ 0.91A (i.e. 910mA), but higher voltages and corresponding current distribution mechanisms may be required in actual situations.
Notes
- The above current values are only estimates based on the assumed rated voltage and power. The actual current may vary depending on the specific specifications of the lamp bead, the working environment, and the circuit design.
- When designing the circuit, the appropriate current value should be determined based on the parameters in the lamp bead's datasheet to ensure the normal operation and long life of the lamp bead.
- For high-power LED lamp beads, a constant current drive circuit is usually required to ensure its stable operation and avoid damage caused by excessive current.