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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