The lumen is a coherent, derived unit listed in Table 3 of the SI Brochure (alongside the watt, joule, pascal, volt ohm, etc).
________________________________ From: Norman & Nancy Werling <[email protected]> To: U.S. Metric Association <[email protected]> Sent: Sun, October 24, 2010 6:39:49 PM Subject: [USMA:48707] Re: flash light standard Pat, I've noticed that American bulb manufacturers are telling consumers to shift our thinking from watts to lumens for the degree of light. Did they make up another term to avoid using a metric unit? Norman ----- Original Message ----- >From: Pat Naughtin >To: U.S. Metric Association >Sent: October 24, 2010 03:34 >Subject: [USMA:48705] Re: flash light standard > > >On 2010/10/24, at 06:31 , m. f. moon wrote: > >I recently bought a new mini maglite led flashlight marked with a set of >parameters labelled FL 1 Standard. These parameters were all in metric and >included "243 cd, 31 m, 9 lumens, 1 m" . I found by google search FL 1 >standard >the new standard from NEMA which defines all of this and more. Some surprise >to >me -- so look it up it is interesting. >> >> >>m moon >Thanks for the reference Marion, > > >I found this YouTube site to be a good explanation for the light unit naive >(like me): http://www.youtube.com/watch?v=aO_l5ciKsPg > > >It's not all metric but clearly they are heading in the right direction. (But >I >was a bit worried about "light energy" being measured and quoted in "lumens". >When I think energy I think joules!) > > >Cheers, >Pat Naughtin >Author of the ebook, Metrication Leaders Guide, see >http://metricationmatters.com/MetricationLeadersGuideInfo.html >Hear Pat speak at: http://www.youtube.com/watch?v=_lshRAPvPZY >PO Box 305 Belmont 3216, >Geelong, Australia >Phone: 61 3 5241 2008 > > >Metric system consultant, writer, and speaker, Pat Naughtin, has helped >thousands of people and hundreds of companies upgrade to the modern metric >system smoothly, quickly, and so economically that they now save thousands >each >year when buying, processing, or selling for their businesses. Pat provides >services and resources for many different trades, crafts, and professions for >commercial, industrial and government metrication leaders in Asia, Europe, and >in the USA. Pat's clients include the Australian Government, Google, NASA, >NIST, >and the metric associations of Canada, the UK, and the USA. >See http://www.metricationmatters.com/ to subscribe. > >
