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Old 24-09-2017, 20:57   #31
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Location: Orchard Park, NY
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Re: Cheap LEDs: amp usage? quality?

All the lamps on my boat have been converted to led with the exception of the steaming, deck lights, and the cabin flourecent which will be the next to go given the lamps illustrated here. The chart table light comes from Lowes with the transformer cut off. It is the least successful conversion in that in two years it has burned out half the leds. (Could have done that on the desk in the house as well perhaps). Who cares about the steaming as the engine is running when on, deck lights are generally used at the dock when plugged in. The warning about the lamp colors are the biggest warning. We try for all warm color but in some lamps it doesn't matter,chart table and flourecent for example. We generally stay away from the Marine stores (price) although the RV folks have had a bigger selection. Major reduction in electrical load is worth it.
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Old 24-09-2017, 21:21   #32
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Re: Cheap LEDs: amp usage? quality?

LED lights are measured in mA - mili-amps. Regular incandescent are run in amps, so the incandescents are over a thousand times more power draw than the LED.

Just get the LEDs. You can't get anything more energy efficient, if power consumption is your concern. Just make sure they are 12V rated.
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Old 24-09-2017, 22:08   #33
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Re: Cheap LEDs: amp usage? quality?

Quote:
Originally Posted by mr-canada View Post
LED lights are measured in mA - mili-amps. Regular incandescent are run in amps, so the incandescents are over a thousand times more power draw than the LED.
No, that is not correct. When we talk about power we talk about Watts, which is the voltage times the current. When considering efficiency we talk about lumens/Watt, where lumens is the measure of light output. If we compare bulbs with the same light output (lumens) we find that halogen is about 30% more efficient than a standard tungsten bulb, while compact fluorescents are about 4 times as efficient, and LEDs are about 5 times more efficient. Approximately, as there are variances particularly with the drive circuits. I am talking only about white lights; red lights are another matter entirely and hugely favor LED technology.

Quote:
Just get the LEDs. You can't get anything more energy efficient, if power consumption is your concern. Just make sure they are 12V rated.
A niggle perhaps, but this is talking about the entire "bulb" as the LEDs themselves aren't 12v. And for most of us we need LED "bulbs" that have buck/boost internal regulators so that the light output remains constant whether the batteries are running low or we have a high-performance (high voltage) alternator regulator driving the voltage over 14v. Cheap LED "bulbs" just use resistors for precisely 12v instead of regulators, which results in varying light output and frequently burned out LEDs from the higher voltages. So look for "bulbs" that are rated from 10v-15v or something similar.

Greg
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