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Common Problems with LED Panels and How to Fix Them

Many of the issues that affect the performance of LED panels are universal to all LEDs, such as flickering, glowing, burnout and buzzing. For detailed information on how to combat these typical problems with LEDs, check out our article How to Stop Your LEDs from Flickering, Buzzing, Glowing and Burning Out.

There are some problems that specifically affect LED panels. The content on this page takes a closer look at these:

white-ceiling

Problems with drivers and voltage conversion

Overview

An LED driver regulates the amount of power that flows through a lighting system. Drivers convert the AC power from the mains supply to the DC power required to run LED panels and therefore prevent power surges. LED drivers are small units that are wired to the LED panel. They play a similar role to ballasts in fluorescent lights.

Drivers are vulnerable to overheating. Even drivers that work correctly will be affected by heat over time. However using cheap, low quality drivers or the wrong driver will mean it is at greater risk of overheating sooner.

This is because the current flowing through the system isn’t kept at a constant level, so the excess heat generated impacts the driver’s performance.

Problems

  • Voltage from the mains power supply is (240v), a driver converts this to 12v or 24v to run the panel correctly. If the driver isn’t working correctly then it doesn’t convert this current and keeps the voltage at a constant level. This means the bulb will flicker and the system won’t react to overloads which means the panels are at an increased risk of burnout.
  • If your LED panel isn’t working at all then the most likely reason for this is faulty internal wiring where the wiring is not connected to the driver correctly.
  • Although not technically a fault with the wiring, fitting dimmable LED panels with an incompatible dimmer switch will cause flickering.

Solutions

  • Ensure your LED panels are compatible with the circuits, power supply and light switches they are running off.
  • Invest in back-lit or central-lit panels (where the LED chips are mounted onto the panel, rather than the edge of the panel), as these panels feature built-in drivers which can help to reduce the problems with drivers outlined above.
  • Ask an electrician to check that the wiring in the lighting system is fitted correctly.
electronic-device-tester

Problems with poor insulation, ventilation and overheating

Overview

LED panels must be properly insulated to ensure the heat they produce is dissipated correcting so they don’t overheat. Quality LED panels are fitted with a heat sink made from a conductive metal (usually aluminium) which transfers excess heat away from the panel. If this heat sink is low quality, poorly fitted or not fitted at all then the excess heat can cause the LED chips in the panel to burnout.

Not all LEDs are suitable to be fitted into enclosed fixtures. Fitting an unsuitable LED into an enclosed fitting can cause it to overheat as the bulb won’t have the appropriate heat sink. This isn’t as much of an issue with LED panels as they are usually designed to fit in enclosed fixtures, however, it’s always worth checking the panels are suitable to be installed into recessed fittings.

Problems

Solution

  • Only buy LED panels with a correctly fitted aluminium heat sink. Ensure the panel is designed to be installed into a recessed fitting.
low-quality

Problems with low quality LEDs

Overview

LED panels are more expensive than traditional fluorescent tubes and for this reason consumers may choose cheap, low quality LEDs and expect the same performance from them as the leading brands. Low quality LED panels often feature inferior components that aren’t tested properly.

LED panels feature a number of components; if any of these components are low quality or faulty it can affect the overall performance of the LED panels.

Problems

  • Frame—usually made of aluminium, the frame contains the light within the panel.
    • If the frame is too light or is made of a material other than aluminium (cheap LED panels often feature a plastic frame), then this could create excess heat and increase the risk of burn out from overheating.
  • LED chips— these chips are mounted to a circuit board and are what produce the light. Depending on the type of panel, they are mounted to the back or sides of the panel.
    • Low quality chips can cause a number of problems including the panel becoming dim or the colour quality being compromised.
    • If low quality LED chips are used in a panel this can produce a ‘blue’ hue which can make a room look cold.
  • Light guide plate—this points the light coming from the LEDs towards the diffuser.
    • If it’s not fitted correctly then this can impact on the amount of light and the angle of the light reaching the diffuser.
  • Diffuser—this ensures the light coming from the LEDs is evenly distributed and helps to reduce glare.
    • A low quality diffuser, made from acrylic or PMMA rather than polycarbonate, won’t distribute light as evenly.
    • Overtime, plastic diffusers can discolour at the edges and turn yellow, reducing the quality of light produced by the LED panel.
  • Reflector plate—this reflects light back into the light guide plate.
    • Issues with the reflector plate can cause glare.
  • Heat sink— this helps to prevent LED panels from overheating as a conductive metal heat sink takes away excess heat to keep the panel cool.
    • A poor quality heat sink will mean not enough heat is dissipated from the LED chips which can cause the chips to burnout.
    • Cheap plastic heat sinks don’t work as effectively as metal heat sinks and can reduce the life expectancy of the LEDs in the panel.
  • Back cover—an aluminium plate that protects the components.
    • The better the back cover fits the frame, the better the heat dissipation which means the panel is likely to last longer.

It’s very difficult to identify whether an LED panel is high or low quality until it is installed. You won’t necessarily know you have a low quality LED until it burns out quickly or produces poor quality light for example.

Solution: How to select a quality LED panel

  • Choose a panel that is at least £15-30 or £30 – 50 for higher end. When it comes to LED panels price does indicate quality. Panels under £12 will go yellow, ripple or warp much quicker.
  • Avoid panels that only have a two year warranty. They only have a two year warranty because they are not built to last! Good quality panels will last longer than this.
  • Choose a panel that has a light guide plate made out of acrylic (PMMA) or methyl styrene (MS).
  • Choose a panel that is finished with powder coating as opposed to paint.
  • Look for a well-constructed frame.
  • Choose a trusted brand. There are plenty of them out there, here are just a few of our favourites:
  • Britesource
  • Philips
  • Osram
  • Toshiba
  • Speak to the company selling the LEDs and ask them about the quality of the LED panels they sell. A trusted company will be able to offer advice. If the company you’re considering buying from are hard to get in touch with then reconsider buying from them.
  • Look at reviews
  • Replace poor quality panels with better quality panels. Sticking with your existing low quality panels will mean existing problems will continue. High quality LED panels where the drivers, optics and LEDs all work at an optimum level could reduce running costs by 25% compared with lower cost panels.

Methyl styrene is the best material to choose for the light guide plate (LGP)

There are a couple of minor indications of quality such as a panel that is finished with powder coating rather than paint and a well-constructed frame however, the real marker of quality comes down to the material used to make the light guide plate.

There are three materials commonly used to make an LGP:

  • PMMA
  • Polystyrene (PS)
  • MS

We recommend choosing an LGP made of MS.

PMMA has the best light transmission and durability but is also the most expensive – it is a high-quality product, but not the most affordable.

PS offers good transmission, but it tends to turn yellow over time due to wear and tear and the effects of heat. It is a well-known issue in the industry and is often why these panels have a warranty of only 2 years. Over time they can also ripple of become warped because they aren’t robust enough to handle normal heat exposure. It is the cheapest option of the three, but we would consider it a low-quality choice.

MS is a combination of PMMA and PS. It provides very good light transmission and is also durable, but at a lower price, is the most cost-effective solution.

Related Content

You can find out more about what LED panels are and how they work with our Guide to LED Panels.

For more information on dimmable LEDs read our guide here.

To find out more about problems with LEDs in general read our guide on How to Stop Your LEDs from Flickering, Buzzing, Glowing and Burning Out.

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Published 2017/04/20