Common Issues and Precautions During the Use of LEP Products
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#1-Irreversible Damage to Laser Chip or Phosphor Caused by Instantaneous Overvoltage or Overcurrent.
Typical phenomenon:
1-The module flashes briefly at power-on and then turns off;
2-The light goes out during use when stationary or under vibration;
3-The module does not light up at all after being powered on;
4-The emitted light is very weak;
5-There is a noticeable dark spot in the center of the beam, and a black mark appears in the center of the phosphor.
Solutions:
1-The driver board must ensure there is no voltage overshoot at power-on. Even a 0.2V overshoot can cause a 0.5A current surge, which can lead to irreversible damage to the laser chip.
2-The driver board must be able to suppress ripple and ensure no transient current overshoot during use.
3-Poor contact at the driver board output connection can easily cause voltage spikes. It is recommended to use direct wire soldering for connection.
Poor Beam Spot
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What happened on the ceramic
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#2-Insufficient Heat Dissipation Causing Brightness Drop
Typical phenomenon:
1-During aging tests, the module brightness drops significantly while the phosphor remains intact.
Solution:
1-A heatsink must be used to dissipate heat from the light source. The heatsink must be in close contact with the heat dissipation surface of the light source. Thermal paste can be applied, but no other materials should be inserted that could cause gaps.
#3-Excessive Assembly Tolerances
Typical phenomenon:
1-Blue or yellow halos appear around the beam edge. A lens placed too far from the module causes blue halos, while too close causes yellow halos.
2-The beam center appears dim, and the light intensity is below the standard level.
Solution:
1-The assembly precision for the lens-to-light-source distance must be ±0.05 mm, which is much stricter than LED requirements. Therefore, positioning must be done according to the reference surfaces provided by the manufacturer.
#4-Electrical feedback
No current
When you power it on, their is no current can be caught. You can only see the voltage. This means the laser diode is damaged.
No voltage
When you power it on, their is no voltage can be caught. You can only see the current. This means the laser diode is damaged.
Very dim beam spot
When you see the driving current and voltage work fine but the beam spot very dim, it also means the laser diode is damaged.