How increase brightness navigation light

[StuM]

Originally Posted by CassidyNZ

Don’t mean to speak for Pete7 but he probably means a masthead tricolour. Mine is a double-decker with the tricolour below and an all-round white (anchor light) above in the same fitting (two bulbs).

Once again, confusion because of incorrect use of terminology. "masthead light" has a specific meaning:

“Masthead light” means a white light placed over the fore and aft centreline of the vessel showing an unbroken light over an arc of the horizon of 225 degrees and so fixed as to show the light from right ahead to 22.5 degrees abaft the beam on either side of the vessel.


and


" A power-driven vessel underway shall exhibit:
(i) a masthead light forward;"




Which is a totally different thing to:

"In a sailing vessel of less than 20 metres in length the lights prescribed in paragraph (a) of this Rule may be combined in one lantern carried at or near the top of the mast where it can best be seen.

[StuM]

Originally Posted by chasfgr

To correct any misapprehension, many people have a combined tricolour/white alternate masthead lighton a sailboat.

No they have "lights at the top of the mast" which are used when sailing (not under power) which is completely different to a "masthead light"

[Montanan]

Originally Posted by scherzoja

Montanan,

Thank you for the apple images, that is very enlightening to those of us who did not inherit that gene combination that leads to red/green color blindness. It was interesting to see that color perception comparison.


GILow, what can one look for to identify a LED driver that will not create interference? Is there a specification they have to meet or some characteristic of the driver to look for?


Thanks

Seek LEDs that are compliant with the standards of set by Comité International Spécial des Perturbations Radio, [CISPR], also known as the International Special Committee for Radio Protection.

Specifically CISPR 25 - Vehicles, boats and internal combustion engines - Radio disturbance characteristics - Limits and methods of measurement for the protection of on-board receivers"


CISPR 12 vs. CISPR 25 - Deciphering Standard Applications
August 21st, 2013

Knowing which standard to use is very important when selecting a test method for evaluating a product. When selecting a specification, the user needs to take into consideration the purpose of the standard. A good example is CISPR 12 and CISPR 25. Both CISPR 12 and CISPR 25 include radiated emissions measurements for vehicles. However, there are a few fundamental differences that the user should take into consideration when determining which standard to use for vehicle emissions measurements.

The radiated emissions measurements of CISPR 12 are performed for the protection of off-board receivers. As an example, this test is done to assure that receivers are not affected when the vehicle drives them. This is very important when the vehicle drives past houses in a city (which are typically closer to the roadway). The radiated emissions measurements of CISPR 25 Clause 5 are performed for the protection of on-board receivers. This test measures the RF interference that is generated by the vehicle and then picked up by vehicle mounted antennas (such as the AM/FM radio or GPS antenna). This is a “RF Terminal” noise voltage measurement that is made at the point where the antenna would connect to the vehicle mounted receiver (such as the AM/FM Radio or Navigation System).

Another thing to consider is regulatory vs. engineering testing. CISPR 12 is used as a regulatory standard by many countries. CISPR 25 is an engineering standard that is used mainly by vehicle manufacturers and not for regulatory purposes. As a quick recap, the next time you are trying to figure out which test to perform when radiated emissions from a vehicle is the concern, ask yourself a couple of questions:

Question #1 - What are we trying to protect (off-board or on-board receivers)?
Question #2 - Are we doing this for regulatory or engineering purposes?
Once those questions are answered, you will know if CISPR 12 or CISPR 25 (or both) are applicable.