Lumens are only one factor among many. Beam width is also a consideration. Lots of lumens in a wide beam may illuminate deck, lifelines, etc. and blind the user. A less powerful but more focused narrow beam may reflect less from the boat but may be less valuable in finding marks.
For instance, here's a powerful spotlight: < http://www.larsonelectronics.com/p-46865-15-million-candlepower-hid-handheld-spotlight-16-ccord-w-cigarette-plug.aspx > If you fired that thing up and tried to use it, you would probably destroy your night vision for a week. Glare reduction is also a factor. The Optronics Blue Eye claims glare reduction technology. However, it gets bad reviews for the cord being stiff and not extending. So far the Streamlite Waypoint looks good but might not be a huge improvement over my existing plain Jane big box spotlight. I continue to explore lights with the newer LED technologies such as the Cree LEDs. I welcome any more comments and suggestions. Dennis C. Touche' 35-1 #83 Mandeville, LA On Thu, Mar 13, 2014 at 10:41 AM, Marek Dziedzic <dziedzi...@hotmail.com>wrote: > Dwight, > > it would be way too simple if everyone used the same measurement units or > the same standards for expressing how bright the light is. > > As I said initially, the light I have is advertised as 800 lm. That is a > lot for a little light like this. I think it is quite bright, but > everything is relative. I don't know, really, how far it would light up an > object. I never tested this. I am much more concerned (when I am biking in > the woods) about very good illumination of objects that are fairly close > (the rocks, the roots, the trees). In fact I carry two lights; one on the > handlebar and the other on my helmet. One shows where I am going, the other > - where I am looking. > > It is a very bright light, but I am afraid that it does not hold a candle > (;-) to some of the big spot lights like the ones that others were talking > about. I think that the biggest issue is not necessarily the brightness, > but the reflector (quality). As someone mentioned, you want to have a very > narrow beam (I am just waiting for a laser application) or you risk getting > all kinds of reflections off the boat's rigging. > > The biggest advantage of the little light like this is that it is small, > reasonably inexpensive and it can point (easily) where you are looking (you > can wear it). The one I have comes with a lithium battery, so it keeps its > voltage quite well (months if not used). > > Marek > > ------------------------------ > > Message: 7 > Date: Thu, 13 Mar 2014 10:56:06 -0300 > From: "dwight" <dwight...@gmail.com> > To: <cnc-list@cnc-list.com> > Subject: Re: Stus-List Waypoint handheld spot lite > Message-ID: <CE37164032B14364B0A1971436DD79E5@your4dacd0ea75> > Content-Type: text/plain; charset="us-ascii" > > Marek > > > > I have some difficulty relating lumen to candela.are these lights focused > so > that all 800 lm are directed.the correlation is usually stated by 1 candela > = 12.57 lumen but with this calculator: > > > > http://www.rapidtables.com/calc/light/candela-to-lumen-calculator.htm > > > > 300000=64228 lumens at an apex angle of 30 degrees so > > > > What does 800 lumens actually look light, bright for distance I mean? > > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > >
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