What bulb

[Adrian]

A bulb has gone on the boat, there are no markings on it i have no idea what type of bulb it is to start looking for one, any ideas what it is and where to get them from?

Thanks

 

[Seven Spades]

It is one of these:-

http://www.cp-lighting.co.uk/Lamps?search=m91

Probably a 12V

 

[Tranona]

Commonly used in interior light fittings on boats. Any chandler will stock them.

 

[sailorman]

A bulb has gone on the boat, there are no markings on it i have no idea what type of bulb it is to start looking for one, any ideas what it is and where to get them from?

Thanks

Im sure you know but dont touch it with little pinkies when you insert the new one.
they are 10 & 20 watt i believe so make sure you get the correct wattage

 

[Seven Spades]

Im sure you know but dont touch it with little pinkies when you insert the new one

Urban myth with a bit of truth. The origin of most halogen bulbs was in the photographic industry where the wattages are 300W + and with the hight wattages they have to be fan cooled and if you touch them the grease on your hands can cause non-linrea expansion and failure.

With 10W lamps that is not a problem, a lot of 10W lamps are now low pressure and some are made of hard glass not quartz.

 

[Angele]

It probably does have some markings on it, but very small. Try looking through a magnifying glass to find out its rating (10W or 20W).

If in doubt, go for 10W and only replace with 20W if it is definitely too dull. If the fitting is only meant for 10W and you fit 20W you can melt the cover (assuming there is one). I know from experience!!

These are standard 12V halogens obtainable from any lighting/hardware/DIY store. You don't need to go to a chandlery.

 

[TrueBlue]

There are more than one size,
G4s are 10 or 20 watt,
GY6.35 for large power 50 or 70W.
There may be others.

Take the dud one with you and measure them up.

 

[Angele]

There are more than one size,
G4s are 10 or 20 watt,
GY6.35 for large power 50 or 70W.
There may be others.

Take the dud one with you and measure them up.

... unlikely to be 50W on a boat (= 4 Amp at 12V). But, hey, you never know!

 

[Adrian]

Thanks everyone, I'll get my magnify glass out ans see if its 10 or 20w

 

[Stork_III]

Thanks everyone, I'll get my magnify glass out ans see if its 10 or 20w

Get Xenon if you can, last longer and run cooler.

 

[Adrian Jones]

Thanks everyone, I'll get my magnify glass out ans see if its 10 or 20w

Please take care!

In my experience a 20w halogen lamp is quite unsuitable for use in a overhead down-light G4 fixture. If a previous owner has forced in a 20w lamp into your particular G4 fixture (it can be done), it will overheat and is a potential fire risk.

If you wish to replace halogen bulbs consider switching to LED replacement lamps they can save 80-90% of your precious battery power, they emit similar levels of light, run very much cooler and last at least 10 times longer than halogen bulbs.

Regards

 

[Adrian]

Please take care!

In my experience a 20w halogen lamp is quite unsuitable for use in a overhead down-light G4 fixture. If a previous owner has forced in a 20w lamp into your particular G4 fixture (it can be done), it will overheat and is a potential fire risk.

If you wish to replace halogen bulbs consider switching to LED replacement lamps they can save 80-90% of your precious battery power, they emit similar levels of light, run very much cooler and last at least 10 times longer than halogen bulbs.

Regards

Thanks Adrian, Ive had the boat from new so no previous owners, Ive ordered a cheapy 10w from ebay to see if its the same brightness. i did see the LED bulbs, can i use them as a straight swap or do i need a different fixture?

cheers
Adrian

 

[Adrian Jones]

Thanks Adrian, Ive had the boat from new so no previous owners, Ive ordered a cheapy 10w from ebay to see if its the same brightness. i did see the LED bulbs, can i use them as a straight swap or do i need a different fixture?

cheers
Adrian

I'm sure 10w is the right halogen lamp.

Marine LED lamps are designed as direct replacements for both internal light fixtures and also navigation and anchor lights.

Try to avoid similar looking cheap LED lamps as they have no built in voltage controls other than simple resistors. The LED light output and current consumption will therefore vary with applied voltage. The cheaper lamps are designed for motor vehicles. A very much reduced service life will result when increased voltage is applied by a modern smart marine battery charger. 16v is now pretty standard when these chargers are applying an equalisation cycle. Applying 16v will double the current taken by a nominal 12v LED lamp and consequently it will become rather unwell!

Regards