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Here is what can happen if a drop of water gets on the AC connection (or inside) of an open-frame LED light, or if the AC cable of a 240/120V light gets corroded:
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Here is an example of how truly waterproof submersible lights can go underwater safely.

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Now I would like to point out an even more dangerous light: the open-metal-frame indoor plant grow light. The "waterproof" lights I covered above are bad enough, but now people are starting to...

Some scrubbers, both DIY and pre-made, have an open top. We created the first open-top scrubber box, but decided even in 2008 to put a cover over it because of the large amount of spray and salt...

This is better, yes. But for manufacturers, you can never depend on what the customer will do. They may set the 12v supply next to their sump and easily spill water on it, thus shorting the line to...

Another problem with most of the metal 240/120 volt lights, is that in order to save more money, they often make the 240/120 volt cord very short, usually just a few inches:


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This means...

My understanding is that UK/EU sellers are required to have proof of safety certification of the entire product before selling or distributing it. This requirement does not exist in the U.S.,...

Some people will say, "These lights are safe, because they were made for outdoor use in the rain".

First of all, this is assuming that the lights were put together correctly in the first place....

Related to salt creep, is corrosion creep. Because the metal case of the bolt-on lights is aluminum, it can corrode slowly (even in freshwater) where the seal is located, especially at the top of the...

For people not familiar with salt creep (maybe you only have freshwater), it gets into everything. Any crack, surface, or other area inside a sump will eventually get at least a light coating of salt...

As an electrical engineer (BSEE), people like me are sometimes asked to be expert witnesses in court cases about electrical safety liability. In the USA, electrical safety is tested, and accepted...

Having invented the waterfall scrubber design in 2008 (water flowing down a screen), we are fairly familiar with how the scrubber works. And how the lights work too. Many people DIY their own...

We at Santa Monica Filtration were the first to test and use these types lights on waterfall scrubbers in the year 2010, as a way of getting away from fluorescent bulbs. Here is a side-by-side test...

The "sealed" metal frame lights are typically used when people build or buy the waterfall scrubber design we invented in the year 2008:


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The light is a metal-case LED lighting fixture...

http://www.algaescrubber.net/240-120-led-light.jpg.....http://www.algaescrubber.net/open-frame-led-med.jpg


Metal-Case LED Light Safety
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This information is linked by LEDsafety.org

With...