So, your type 1891 incandescent lamp is rated at 2 spherical candle power, which is equivalent to 25 lumens.
---- Steve Thomas via CnC-List <[email protected]> wrote: This link to a GE miniature lamp catalog contains a wealth of information. Brightness is expressed in "spherical candlepower", where one candela is approximately equal to 12.5 lumens. Don't get distracted by sites with purist definitions, this is close enough for farm use in this context. http://www.csobeech.com/files/GE-BulbCatalog.pdf Steve Thomas C&C27 MKIII Port Stanley, ON ---- "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 _______________________________________________ This list is supported by the generous donations of our members. If you wish to make a contribution to offset our costs, please go to: https://www.paypal.me/stumurray All Contributions are greatly appreciated! _______________________________________________ This list is supported by the generous donations of our members. If you wish to make a contribution to offset our costs, please go to: https://www.paypal.me/stumurray All Contributions are greatly appreciated!
