Bullet led lamp beads are widely used in automotive lighting, stage lighting and high-end industrial lighting due to their unique focusing design and high-efficiency performance.
The power of the driving power of bullet led lamp beads should be slightly higher than the total power of the lamp beads. It is usually recommended to reserve a margin of 20%-30%. For example, if the power of a single lamp bead is 1W, and the total power is 10W when 10 are connected in series, a 12W-13W driving power supply should be selected. Current matching is particularly critical, and it is necessary to ensure that the output current of the driving power supply is consistent with the rated current of the lamp bead. For example, if the rated current of the lamp bead is 350mA, the constant current output of the driving power supply must be accurately set to 350mA. Too high current will cause the lamp bead to overheat, and too low current will not be able to stimulate its optimal brightness.
The voltage matching of bullet led lamp beads needs to be adjusted according to the connection method. If series connection is used, the output voltage of the driving power supply should be an integer multiple of the forward voltage of a single lamp bead. For example, the forward voltage of a single lamp bead is 3.2V, and the total voltage requirement is 32V when 10 are connected in series. If parallel connection is adopted, the output voltage of the driver power supply must be consistent with the forward voltage of a single lamp bead, and the output current must be a parallel multiple of the current of a single lamp bead.
Bullet led lamp beads usually adopt constant current drive because its current stability can avoid brightness changes or light decay caused by voltage fluctuations. Constant voltage drive is suitable for low power and low current scenarios, but it needs to be matched with current limiting resistors and has lower efficiency than constant current drive. For example, in automotive headlight applications, constant current drive can ensure that the brightness of the lamp beads is always stable when the battery voltage fluctuates.
The protection level (IP level) of the driver power supply must match the application scenario. Bullet led lamp beads used outdoors need to be matched with a driver power supply of IP65 or above to resist rain and dust erosion. At the same time, heat dissipation design is very important. It is recommended to choose a driver power supply with a metal shell or a built-in heat sink to ensure long-term stable operation in a high temperature environment. For example, in stage lighting applications, high-power driver power supplies need to be matched with forced air cooling or water cooling systems.
If the bullet led lamp beads need to realize dimming function, the driver power supply must support the corresponding dimming protocol. Common dimming methods include PWM dimming, 0-10V dimming, and DALI dimming. For example, in smart home scenarios, PWM dimming can achieve stepless brightness adjustment, while DALI dimming is suitable for large commercial lighting systems. It is necessary to ensure that the driver power supply is fully compatible with the protocol of the controller or dimmer, otherwise flickering or dimming problems may occur.
When selecting a driver power supply, it is necessary to pay attention to whether it has passed international certifications such as CE, UL, RoHS, and whether it meets energy efficiency standards such as Energy Star. For example, a driver power supply that meets the Energy Star standard can reduce energy consumption, extend the life of the lamp beads, and reduce heat generation. Poor-quality driver power supplies may have problems such as false power and low efficiency, and long-term use will accelerate the aging of the lamp beads.
Taking car headlights as an example, if 10 3Wbullet led lamp beads are connected in series, a driver power supply with an output voltage of 32V-36V and a constant current of 3.5A must be selected, and it must have overvoltage, overcurrent, and short-circuit protection functions. In industrial lighting, if the lamp beads are designed in parallel, the output current of the driver power supply needs to be adjusted according to the number of parallel connections, and heat dissipation measures need to be added to cope with high temperature environments.
The driver power supply matching of bullet led lamp beads needs to be comprehensively considered from multiple dimensions such as power, current, voltage, protection, dimming, and certification. Through precise matching, the lamp beads can be ensured to operate efficiently, stably, and safely, while extending their service life. In practical applications, it is recommended to give priority to well-known brand driver power supplies and customize the design according to specific scenarios.
