How Can LED Pool Lights Be Waterproof?

Waterproof LED pool light

LED pool lights need to work underwater or in wet environments and being waterproof can extend the life of your pool light and ensure safety. This article describes common waterproofing techniques for LED pool lights and compares resin-filled waterproofing and structural waterproofing in detail.

Waterproofing Technologies

Below are the 4 most common waterproofing technologies for LED pool lighting.

Waterproof Materials

Manufacturers usually make the housing of LED pool lights from stainless steel, plastic, tempered glass, etc. These materials are inherently more waterproof.

Waterproof Power Cable

The power cable for LED pool lights must be completely waterproof to ensure electrical safety. Waterproof power cables that are VDE certified are safer.

Sealing Gaskets

Gaskets often prevent water from entering through the gaps in the luminaire body at the joints of underwater luminaires.

Resin-Filled Waterproof

A special resin fills the light source and other electronic components of the pool light to completely isolate them from water or other foreign matter.

Introduction to Resin-Filled and Structural Sealing

Resin-filled waterproofing seals the light source and other electronic components of the LED pool light. Structural waterproofing relies on a well-sealed housing to keep water out of the light body.

Resin-Filled Waterproofing

Pool lights using the resin-filled waterproofing process require a filler hole in the light source. During the filling process, the production worker inserts a tube into the filling hole. The other end of the tube is connected to the injection port of the filler. The special resin is then injected through the tube into the light, filling the interior of the light source.

The worker then disconnects the tube from the filling port and closes the tube with a sealing clip to prevent foreign matter, such as dust, from entering the lamp through the tube. These resin-filled light sources remain for several hours until the resin has completely set.

Resin-filled waterproof pool light sources

Structural Sealing

A pool luminaire using this process requires a standardised design for its luminaire housing to enable fitting gaskets at each joint. The entire luminaire relies on a unique structural design with gaskets to provide water resistance.

Rubber or silicone, which are flexible and elastic, are usually used to make gaskets. When squeezed, the rubber and silicone deform, creating contact pressure and blocking the gaps to provide a good seal.

Pool lights with structural waterproofing do not require a filler hole at the light source because they do not need to be filled with resin.

Comparison of two waterproofing processes


If the pool light uses a resin filled waterproofing process then it will cost more to manufacture.

As you can see from the waterproofing process described above, producing a resin-filled waterproofing product requires injecting resin into the light source. The light source must remain untouched for several hours to allow the resin to cure, resulting in a longer production cycle. In addition, the glue that is injected into the lamp body is not cheap.

Products using the resin-filled sealing process sell at a higher price. This is in comparison to similar structural sealing products. The reason for this is the long production cycle and high material costs.


Resin-filled waterproof LED pool lights seal completely against dust, liquids, air and other foreign matter and have an IP68 rating of 100% for all products.

LED pool lights with structural waterproofing are subject to factory manufacturing capabilities, test levels and ageing of gaskets, some products may have problems with water ingress. When ordering it is best to check the product certification to confirm the quality of the pool light.

LED pool light waterproof test

Also try to choose a product with a longer warranty. Products with longer warranties cost more in materials, workmanship and product testing and are more consistent in quality. The after-sales service can repair or replace an individual product with a new product if it has a problem with water ingress within the warranty period.

Life Expectancy

The lifetime of products with a resin-filled waterproofing system is slightly shorter than that of products with a structural waterproofing system. Filling the LED pool light with resin reduces the heat dissipation effect. During use, the temperature of a resin-filled waterproof pool light will be slightly higher than that of a structural waterproof pool light, given the same parameters and environment. The increase in temperature will accelerate the light decay of the LED pool light. Resin-filled waterproof pool lights decay faster than structural waterproof pool lights.

Quality LED pool lights have a life expectancy of over 50,000 hours. The difference in light decay rates between the two types of pool lighting is largely invisible during use. Therefore, there is no need to worry too much about the difference in life expectancy between the two products during daily use.


The resin used in the resin filling process is colourless and transparent with very high light transmission. In the early stages of use there is no significant difference in appearance. However, after prolonged use, the resin inside the lamp will gradually age. The water resistance of the aged resin will not deteriorate, but it will look slightly yellowed. The light transmission decreases and slightly affects the lighting effect of the LED pool light as the resin yellows.

This does not happen with structurally waterproof pool lights. However, after prolonged use, a layer of dirt can develop on the pool light’s body and lens, affecting the appearance and lighting. Simply cleaning the pool light regularly will solve this problem.


The resin-filled waterproof pool light is sealed with all its electronic components. If it is damaged it cannot be repaired and only the entire light source can be removed and replaced.

The structural waterproof pool light is much more flexible when it comes to repairs. In the event of problems such as deteriorating gaskets or damaged electronic components, replacement or repair is possible by disassembling the fixture.

How Do I Choose?

Both waterproofing processes have unique features that you need to consider in relation to your needs.

If you have a limited budget and need a product that is completely waterproof, we recommend resin-filled plastic waterproof pool lights.

resin-filled plastic waterproof pool light

If you’re looking for a high-quality product that’s durable and has a great look, we recommend a stainless steel waterproof pool light that utilizes a structural waterproofing method.

stainless steel waterproof pool light

WAKING Lighting is a professional LED pool light manufacturer, and we are also experts in the field of waterproof pool lights. If you want to purchase our products or have any questions about product knowledge, please feel free to contact us.

Are you looking for a professional underwater light supplier? Contact us now!

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