Poor quality power supplies can cause the same light bar to be less bright

Frequently Asked Questions

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Practical Tips Before You Order

Before placing an order, always confirm three things: first, double-check your exact dimensions and corner angles against your space. Second, ask for a physical sample before mass production—what looks good on screen may feel different in person. Third, plan for spare parts (LED strips, drivers, edge strips) at the same time as your main order, because reordering small spare parts later usually costs more than the parts themselves.

For long-term projects, we recommend keeping a detailed spec sheet for every installation: what size frame, what color strip, what LED color temperature, and which driver version. This makes future replacements and maintenance much faster. EEYUN has been manufacturing SEG lightboxes, aluminum profiles, and LED strips in Hangzhou, China since 2010, and we support OEM/ODM for distributors and brand owners worldwide.

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If the power supply power is 200W, considering the high temperature inside the light box, the general full-load power is 80% of it, that is, 160W; but some poor power supply may start to reduce voltage when it reaches 120W, which will lead to the light bar can not get enough voltage to reduce the brightness.

Cause Analysis
The brightness of the light bar depends on the current flowing through it. The power of the power supply determines the maximum current it can provide. When the power supply is not powerful enough, it cannot provide enough current, resulting in a decrease in the brightness of the light bar.

Influencing Factors
The extent to which the brightness of the light bar decreases depends on the following factors:
**The degree to which the power supply is underpowered:** The more underpowered the power supply is, the more pronounced the decrease in the brightness of the light bar.
**Power of the light bar: **The higher the power of the light bar, the higher the power requirement of the power supply.
**The voltage of the light bar: **The higher the voltage of the light bar, the higher the requirement for power supply power.

Solution
In order to avoid the decrease of the brightness of the light bar, you can take the following measures:
**Choose a power supply with sufficient power:** The power supply power should be greater than or equal to the total power of the light bar.
**Use more than one power supply:** If the power of the light bar is large, you can consider using more than one power supply.
**Reduce the power of the light bar:** The power of the light bar can be reduced by lowering the voltage or current of the light bar.

Caution.
Using a power supply with insufficient power may cause the light bar to overheat, shorten the service life of the light bar, or even cause safety accidents such as fire. Therefore, attention should be paid to safety when selecting and using the power supply.

Summarize
Light bar brightness is one of the important indicators of light bar performance. Choosing a power supply with sufficient power can effectively ensure the brightness of the light bar, extend the service life of the light bar and improve safety.

EEYUN company contact information：

Email: alice@eeyun.ltd
Tel: 0086 159 5803 6971
Website: eeyundisplay.com