Dennis,
Watts is watts. A 3.4 watt bulb at 12 volts (0.28 amps) will draw 10x
the current as at 120 volts (.028 amps). but the lumens should be about
the same, I think.
Gary
S/V Kaylarah
'90 C&C 37+
East Greenwich, RI, USA
~~~~~~~_/)~~~~~~
On Mon, Sep 4, 2017 at 12:19 PM, Dennis C. via CnC-List <
cnc-list@cnc-list.com> wrote:
> I replaced the bulb in Touche's binnacle compass this weekend. Really
> wanted to look at an LED bulb but got hung up on the brightness. I just
> replaced it in kind from an auto parts store.
>
> The original bulb was a trade number 1891, 3.4W, 12 VDC mini-bayonet
> (BA9S) base. It's not difficult to find the correct base and height but
> determining the brightness is confusing. I don't need a compass light that
> can be seen by the International Space Station.
>
> The new specification for LED bulbs is in lumens. I did some quick
> research on the Web but couldn't find a reliable conversion for watts 12
> VDC to lumens. Found some sites for 120 VAC but not 12 VDC.
>
> So, how many lumens is a 3.4 watt 12 VDC bulb?
>
> Has anybody found a decent website for converting watts 12 VDC to lumens?
>
> Dennis C.
> Touche' 35-1 #83
> Mandeville, LA
>
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