--- MightyChimp <[EMAIL PROTECTED]> wrote: > Rowlett defines foot-candle as such: > > footcandle (fc or ftc) > a traditional unit of illuminance or illumination... Illuminance is now measured > in lux;... > > It is an obsolete unit of illuminance and has been > replaced by the lux...
Thanks, Euric, for the explanation. Indeed, I noticed their correct use of lux, but they seem to insist on marketing this product by this hideous stuff... >... You must contact this person and have him remove at > once the obsolete term foot-candle from his > literature and stick completely with the unit lux. I evidently agree. I just need to contact my wife again and inquire more about this company for that purpose. > I would think there is an error here as 2000 lux > seems like a real bright light for a dental device. > What is this device used for? Recently I had some > of my old silver amalgam filings replaced with epoxy > type. They used some type of science fiction > looking type laser gun that emits a purple light for > speeding up the hardening. Is this what this > product is suppose to do? Or is this the bright > light used to see into the mouth? > Yes, I guess that's what this unit is for (some curing mechanism). > The unit watts per square centimetre is incorrect as > it is stated and should be expressed as watts per > square m (W/m^2). It is not proper SI to used > prefixed units (other then the kilogram) in the > denominator of a fractional expression. > I guess this is a legacy of old metric that used to quote stuff by the centimeter. > In reference to the use of watts per square metre it > would appear to be a measure of how much light > energy is striking a one square metre surface each > second... > Yes... so it seems. In any case, perhaps the physicist(s) among us may shed some light on this subject. I do need a more technical explanation on this so that I can properly write my post to them. Your first part addressed that, but I need some more for the second part (his question 2). > Personally, a product that can't use correct units > or unit conventions is a product to avoid. The use > of old and obsolete units speaks clearly that the > device is the product of obsolete thinking and is of > no use in the 21-st century. > The only problem is that apparently MANY companies that manufacture this type of tool seem to market their product in such hideous fashion. And I thought that dentistry was like medicine: fully metricated... :-(.............. Thank you for your answer, Euric. Take care. Marcus ===== Jesus ONLY settles for THE best, so what excuse can you possibly give to NOT go SI??? ______________________________________________________________________ Post your free ad now! http://personals.yahoo.ca
