Mini speedometer backlight wattage

[Eotnak]

I'm designing the electrical for a build and I am planning on buying these gauges from Mikes:

https://www.mikesxs.net/yamaha-xs650-speedo-1-9-white-face-0-140-mph.html
https://www.mikesxs.net/yamaha-xs650-tacho-1-9-white-face-0-12000-rpm.html

Speedometer and tach. Does anyone have these? Is it backlit with an LED or bulb? Any chance you know the wattage? I'm assuming 100mA draw each incandescent or 50mA for LED. Does that sound right?

Thanks!

 

[TwoManyXS1Bs]

Traditional LEDs use a max of 20ma, but are often configured to use 10ma. So, at 12v, with a current limiting resistor, expect anywhere from 1/8 to 1/4 watt.

Traditional incandescents are 3 watt. At 12v, that's 1/4 amp...

 

[59Tebo]

Those gauges look pretty cool. Please send pics and a progress report!
TM,
Can you please explain/describe the current limiting resistor?

 

[Eotnak]

Thanks to both of you!

Apparently LED's draw too much current by themselves and can have a short life from current/voltage spikes or something. Whenever I see a circuit there is always a resistor with an LED.

I found this article but it doesn't help me with some of my LED's that I wasn't given specs on.

https://www.evilmadscientist.com/2012/resistors-for-leds/

I was assuming I would just pick an amperage and aim for that. 10mA sounds good I guess!

 

[5twins]

Actually, I think the original bulbs were rated at 3.4 watts, not that it would make much difference.