How many watts should I have? Underwater LEDs – The Hull Truth – Boating and Fishing Forum

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how many watts should i have? underwater leds - the hull truth - boating and fishing forum how many watts should i have? underwater leds


simple question that i’m sure will have 100 answers. i have a 26′ boat running in maine waters. i just bought a pair of 9 watt leds (18 watts total). is this going to be enough to produce a nice effect and raise some bait?? how many watts do i need?

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+61404532026, 09:29 pm

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60+ people have looked at this and no one has an opinion??kill’in me. i have to wait till spring to know for sure. i need some input. thanks!

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+61404532026, 02:38 am

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how many watts should i have? underwater leds - the hull truth - boating and fishing forum

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how many watts should i have? underwater leds - the hull truth - boating and fishing forum


i have never heard of watts being any way to judge an underwater led. just let us know what light you bought, then you’ll get some replies.

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+61404532026, 03:04 am

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how many watts should i have? underwater leds - the hull truth - boating and fishing forum


originally posted by yachtjim

i have never heard of watts being any way to judge an underwater led. just let us know what light you bought, then you’ll get some replies.

x2

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+61404532026, 03:35 am

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how many watts should i have? underwater leds - the hull truth - boating and fishing forum


originally posted by cburgess

60+ people have looked at this and no one has an opinion??kill’in me. i have to wait till spring to know for sure. i need some input. thanks!

the problem with your question is
who watts are not normally used to measure the brightness of led lights as with the older styles of incandescent light bulbs. sometimes manufacturers of leds will provide an “equivalent” rating which perhaps is where you got your description of “9 watt leds”

that does not tell anyone very much because it is not a standardized measurement and thus is why if you specify the brand and model you bought, people will have a way of answering your question.

my guess without more information is that your lights are probably not going to be able to put enough light into the water to attract bait from any distance. for example, the ocean led amphibian t12 is one of the most popular leds and is a pretty bright unit. according to the manufacturer, a single t12 is “equivalent” to a 35 watt xenon light. so if your 9w was calculated the same way as the 35w for the t12, the lights you bought have only about 1/4 the output — not going to do too much to light up the water behind your boat for any distance.

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+61404532026, 09:11 pm

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hey cburgess,

nomans made several good points. the issue when measuring light output in watts is
who there is really no established baseline. is it a 9w comparison of incandescent lighting, halide lighting, plasma, xenon, halogen?if you could get the lumen output of the light then it would be much easier to make a comparison.

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how’s the water quality in maine? i believe i know what kind of led lights you have. you should be able to see some light around the transom, however the light is not going to penetrate very far out/down.

thanks,

bryan

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+61404532026, 12:51 pm

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nomans and flo gave you some good info.

i’m a commercial lighting guy, warehouse, office ect. led is only good for spot lights or small general illumination. meaning if you tried to make an led flood light, the light will only carry for a few feet. they look really bright when yo look directly into one but shine it on something and the light does not reach out. now we measure light out put in a lamp as lumens per watt. an led has about 50-60 lumens per watt the same as a fluorescent so a 9 watt led is the same as 9 watt fluorescent which is equivalent to a 36 watt incandescent bulb. not very bright.

what you bought is for decoration.

do you have an inverter on the boat? i can tell you a very cheap way to make an underwater light.

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+61404532026, 12:14 pm

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how many watts should i have? underwater leds - the hull truth - boating and fishing forum


hey christos,

have you seen the data sheets for many of the cree led product line? many high quality led’s are capable of 100 lm/w+. the new cree xp-g2 can put out 151lm/w at 350ma. even low bin 3w chinese led’s are in the 70-85lm/w ballpark.

the main issue is how you focus light from an led. most led’s come from the factory with a 120 degree viewing angle. this is great if you’re illuminating an object from 2 feet away, however it becomes an issue when you are trying to project light. this is where led optics come into play. an led high bay light mounted 18ft. above the floor with a 90 degree beam angle will light about a 7 x 21ft area with plenty of par. led lighting can be used for much more than spot lights, or general illumination as long as it’s utilized correctly.

if i’m thinking of the correct 9w model you have, then you should have 30 degree optics on your light. which will project light, but water quality is going to determine how far it will project.

btw christos, i hope i didn’t come off as rude. just trying to inform the op about led technology.

thanks,

bryan

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