Dennis
The calculator link that I sent allows you to vary apex angle, still it is hard to compare the lights.for a spotlight to use in the fog I like my 300,000 candela hand held spot light with long coiled cord, 12 vdc supplied light, glare is not a problem but reflection off the white deck is, but the real problem when I use it is steaming in dark and foggy conditions at night. I have various LED flashlights, the one from Lee Valley throws a good beam for a long distance and I have other less powerful LED flashlights for walking around on the boat at night and a bedside LED lantern that is very nice for those trips to the head. http://www.rapidtables.com/calc/light/candela-to-lumen-calculator.htm _____ From: CnC-List [mailto:[email protected]] On Behalf Of Dennis C. Sent: March 13, 2014 1:37 PM To: CnClist Subject: Stus-List Handheld spotlights 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-handhel d-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 <[email protected]> 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" <[email protected]> To: <[email protected]> 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 [email protected]
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