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Old 29 October 2007, 07:30   #51
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Andy, just a thought for you. I've no idea how you intend to wire your leds but if you are putting one resitor into the leg of each led then the wee ¼watt resitors which cost pennies will be fine but if you plan to run them in parallel with one resitor in the main lead, you'll need to ensure your resitor can carry the power. Eg. say you have 10 of your leds and one 680R resistor you'll be using about 3 watts. A 3 watt resistor, or better still, a 5 watt resistor is a fairly chunky thing and it will get warm.
You can put your leds in series and if you do your sums you can get away without a resistor but if one led fails then they will all go out.
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Old 29 October 2007, 07:40   #52
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...saved me researching the formular for changing the resirtance and altering the voltage
V=I x R therefore V ÷ I=R

Your voltage when the engine is running will be about 14v.
Your led specs said 30mA continuous running but they also said they derate as the temperature rises. Since neither of us know what the running temp will be, I reckoned about 20mA (0.02 amp) would be sensible.
So, 14 ÷ 0.02 = 700R. The nearest preferred value reistor is 680R. Voila.
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Old 31 October 2007, 11:21   #53
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Quote:
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V=I x R therefore V ÷ I=R

Your voltage when the engine is running will be about 14v.
Your led specs said 30mA continuous running but they also said they derate as the temperature rises. Since neither of us know what the running temp will be, I reckoned about 20mA (0.02 amp) would be sensible.
So, 14 ÷ 0.02 = 700R. The nearest preferred value reistor is 680R. Voila.
whats that working out jw??
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Old 02 November 2007, 21:00   #54
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Whilst in Maplins today buying radio connectors, I thought I'd purchase some LEDs.

I bought 4 LEDs of different types 2 in red and two in blue. Whilst having a play with these tonight I have discovered how hot these little diodes get. Is this a factor to take into consideration when mounting them?
Whilst in Blasingsmoke (Basingstoke) this evening I was lucky ? enough to follow a Focus that had numerous LEDs at the rear. He had loads of blue ones around the rear window and two red ones, one in each number plate screw holder. Although it looked prattish I must say they were very bright. Enough that one of the red LEDs was bright enough to hide one of the number plate numbers. I managed to get a picture on my mobile phone which I should be able to post at the weekend.
The picture was got whilst I was walking round the Asda car park and said car was parking in the handicapped parking spots.
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Old 25 November 2007, 14:45   #55
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If you want some pretty cool hull lights, then I think these might be the answer. Little bit pricey at £500+ but you'd certainly see where you're going. Xenon HID's are certainly the best car headlamps I've ever had.

http://http://www.hellamarine.com/?a...ID=154&pcid=22
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Old 26 November 2007, 05:12   #56
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You getting a pair for you boat Keith?
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Old 26 November 2007, 06:40   #57
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You getting a pair for you boat Keith?
Nope. Just a pipe dream really. Wouldn't have the guts to cut two holes in my new hull anyway.
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Old 26 November 2007, 06:48   #58
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Yeh, know what you meen. Didn't want to cut a hole in the deck for a bilge pump/access to fitting an internal transducer.
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Old 07 May 2008, 19:31   #59
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Can I choose any colour deck light?

I'm trying to work out what the best colour deck light would be.

I wanted red for the footwell of the console as this is a kind colour to the eye and doesn't cause too much night vision problems, however I thought that the red glow might be mistaken for the port side Nav light.

Any Ideas?
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Old 08 May 2008, 03:22   #60
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... I thought that the red glow might be mistaken for the port side Nav light.
I use two red LED lights and do sometimes worry that they might be seen as nav lights, but I reckon that so long as they are mounted low down then it should be ok.

If a ship can see a clear green and an intermittent red glow I think they would assume they were looking at your stb side. From a colreg point of view, what you really do not want is rogue green lights coming off your boat - that could be bad.
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