Dennis,
I should add that it matters if the LED bulb distributes the light
differently. If the lumens are the same, but the light distribution is
different, then I would think the bulbs would not be equivalent.
Gary
~~~~~~~_/)~~~~~~
On Mon, Sep 4, 2017 at 2:35 PM, Gary Russell <[email protected]> wrote:
> 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 <
> [email protected]> 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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