Lighting FAQs

Lighting FAQs
Lighting FAQs

If you have any further questions please call us on:+44 (0)1476 576280

Do you manufacture induction / contactless Lights?
Our yacht lighting brand - BGB SILS (Submersible Inductive Lighting System) manufactures contactless lights that requires no drilling of the hull. SILS can also be used in aquariums or other marine or non-marine environments. Visit for more information.

To what depth can you test your underwater lights?
We have the facility to test our products to 800 bar (8000 metres).

Why would I need underwater lights in my fish farm and what is the benefit?
Underwater lighting slows down the maturation process, photo period manipulating the stock of fish to shift their breeding season. Basically, the light will slow down maturation of the fish by causing them to think it is still daylight outside hence enabling them to be fed longer and grow in size. If lights were not used to photo-manipulate the fish then they would mature at a low weight and the meat would not be edible. Another benefit is that you can put the fish to sea at several times in the year instead of the normal spring time.

Why do I need underwater cameras in my fish farm?
Feeding the fish is one of the costliest parts of fish farming, underwater cameras enable you to monitor the feed and make sure it goes to the fish, and not lose pellets through the bottom of the net. The cameras are linked up to computers and / or monitors on land which means you can take control of the whole feed system from the shore base. It’s also advantageous in bad weather when you can’t get out to the farm, the fish are still getting fed and you can see what’s going on.

What effect does the use of light have upon the weight of the fish / fish mass?
According to our customers we believe there to be more than 10% difference in size/weight. Stirling University have conducted their own in-depth research to provide further evidence of growth patterns.

What is the Lumens output for your lights?
Please see our product datasheets for answers. Our Pisces 1000 Output is 90,000 lumens

What is the life-cycle for your lamps?
Please see our product datasheets for answers. Our Pisces 400 lamp life is rated at: 16000 hours typical N.B. This is a statistical value based on the number of operating hours at which 50% of the lamps originally started will still be operating

How many lights do I need per cage?
Number of lights depend on several factors; turbidity of water, size of cage, stock size, breed of fish. BGB Marine representatives will be happy to assess your requirements. Contact: 00 44 (0)1476 576280.

When do the lights need to be on?
It depends on the maturation cycle of your fish. BGB Marine representatives will be happy to assess your requirements. Contact: 00 44 (0)1476 576280

If I smash the well glass accidentally will I loose all the internal components?
If the well glass is smashed then the only components needing to be replaced will be the lamp and obviously a new well glass. All control gear is sealed into the main body making it water resistant. We would recommend that you send the luminaire back in this situation so that we can fit the new well glass and pressure test the unit to make sure it is properly sealed.

How many volts do I need to run the lights?
We run at 230v into the pen rather than 600v. We believe this to be a safer and more economical way to use the lights.

Which luminaire should I use the Pisces 1000 or the Pisces 400?
Early scientific results when comparing these two lights against growth of fish shows that it is much better to have an even "blanket” spread of light throughout the cage. We will always recommend that you use a larger quantity of 400W lights and spread them out so you can achieve a blanket of light. With the introduction of the new Pisces LED, careful attention should be paid to the difference in cost savings over a period of time as LEDs will last a greater length of time over metal halide.

What length of cable will be needed on the farm?
This depends on your particular requirement. Our standard length is 25 metres, however bespoke lengths can be purchased.

Can I run my Pisces light(s) out of water?
No. The lamp requires the presence of water to keep it cool. What plug options are available for the Pisces 400 power cable topside?
The Pisces 400 power cable topside is supplied with a blue I.P 67 connector the industry standard; this allows easy connection into cage side boxes. However, we can supply just bare tails or a connector of the customer’s choice. We do sell a wet / dry light - Amphibian that you may want to look at for use in and out of water.

How do I connect the Pisces 400 luminaire to my power supply?
When connecting the luminaire to a power supply it is strongly recommended that you use a waterproof, cage side box, housing an RCBO or RCD; coupled with a miniature circuit breaker, this provides circuit protection and protection against electrical shock. This cage side box is normally hard wired to the generator / distribution board and the luminaire is connected to the cage side box via the short cable assembly and blue I.P 67 connector supplied with the luminaire. We can quote on any size of cage side box to protect the user and the lights, please provide us your requirements.

I want to put lights on the hull of my yacht, but do not want to risk any damage or mess!
Our Submersible Induction Lighting system requires no drilling of the hull whatsoever, therefore there is no risk to any very expensive yachts. Please visit for all yacht light FAQs.


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