恒流驱动与恒压驱动对比
这个选择决定灯具装上去能不能正常工作。
灯带需要固定电压、自行取流；COB 模组需要固定电流、电压浮动。两者配错，是 LED 改造失败最常见的原因之一。
| 对比维度 | 选项 A | 选项 B | 优胜 |
|---|---|---|---|
| Output | Fixed current, voltage floats in a range | Fixed voltage, current set by the load | Different load |
| Typical load | COB and high-power modules | LED strips and low-voltage systems | Different load |
| Dimming | Often built in on higher-end drivers | Usually needs a separate dimmer | Constant current |
| Voltage drop | Not a concern over short runs | Critical on long strip runs | Constant voltage |
| Failure mode if mismatched | Under-driven light or thermal stress | Hot spots, colour shift, short life | Both |
| Rule of thumb | One driver, one module family | Size the driver at least 20% above load | Both |
结论
按负载选驱动类型：模组用恒流，灯带用恒压；恒压驱动至少留 20% 余量，避免长距离压降导致末端变暗。
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📋 权威标准出处
IEC 60529 · CIE 13.3 · ANSI C78.377 · IES LM-79 / LM-80 · UL 1598 / UL 8750 — 数据由 CompareDeals 团队核验。