[Shop-talk] led security lighting vrs incandescent`

[Donald H Locker]

Never let it be said that I left an email unread!

I'd also strongly recommend going to the lower colour temperature lamps, especially for "security" lighting. The higher CRI lamps (daylight, or "white") kill night vision so you can't see anything outside of the bright area. Better to have relatively dim, warm lamps where needed so you can see better (and more quickly) everywhere else.

Helps night sky watching too!
Donald.

----- Original Message -----
> From: "Peter Murray" <peterwmurray at gmail.com>
> To: "shop-talk" <shop-talk at autox.team.net>
> Sent: Thursday, November 6, 2014 1:48:07 PM
> Subject: Re: [Shop-talk] led security lighting vrs incandescent`
> 
> I'll echo what has been said about avoiding Feit Electric. We redid our
> kitchen a little more than 3 years ago and have about 7 of the Cree
> in-ceiling lights, and they're great. We also have 8 PAR38 cans in the
> basement, and I replaced all of those incandescent bulbs with Cree LED
> bulbs about a year ago, and all of those are still just fine.
> 
> We have some CF lights in some places where I just turn the light on and
> leave it on for hours. I have seen plenty of evidence that short-cycles
> with fluorescent bulbs leads to short bulb lifespans. I won't buy any more
> CF bulbs. LED is just as cost-effective, and doesn't have that pesky
> mercury (and is not as fragile).
> 
> For security lighting that isn't on for long periods, incandescent is still
> a very cost-effective solution. I bought a security light with built-in
> LEDs, and haven't installed it yet. I'll report back what I find. It isn't
> high-powered for distant wide-angle coverage, it is designed for over an
> outside doorway or similar.
> 
> Regarding light color, I have found that the 5000K and up bulbs are far too
> cold/sterile/harsh for my liking. I have found that (to my eye)
> temperatures between 3000K and 3500K (typical mid-point color temperature
> choice) yield the most "natural" lighting, and are often mistaken for
> conventional/halogen incandescent.
> 
> -Peter
> 
> On Thu, Nov 6, 2014 at 10:05 AM, Peter J. Thomas <pj_thomas at comcast.net>
> wrote:
> 
> > On 11/5/2014 6:39 PM, Randall wrote:
> >
> >> so I'm thinking of replacing and considering LED....  I know the cost
> >>> difference but I like the low wattage and long life expect...     my
> >>> question
> >>> is the light output   how do they compare watt for watt as far as flood
> >>> light
> >>> illumination !!!   are they as bright ??   fill me in led gurus
> >>>
> >> Actual "watt for watt" they are much brighter, the difference is roughly
> >> 7:1.  However, watch out for "equivalent watts" as they frequently don't
> >> tell the right story.  Compare lumens, not watts.
> >>
> >
> > The ratio for halogens will be a little lower.  Halogens are more
> > efficient than non halogen incandescent.  Probably closer to 5:1 but still
> > a significant savings. Randall is correct, lumens are a better comparison
> > but if you don't know the lumens a good guess is 100W LED fixture.
> >
> > Daylight bulbs are little more efficient than soft white.  LED bulbs are
> > actual florescent because they use phosphors to improve the quality of the
> > light.  A white LED without phosphors produce a bluish light, guessing
> > 7000K, so phosphors provide a color shift by absorbing the 7000K light and
> > remitting 5000K.  The higher the kelvin light color of the bulb the higher
> > the efficiency.  Though I stick to a kelvin around 5000K.  Higher than that
> > you are might be wasting energy producing colors that you can't see well;
> > meaning though a 5000K and a 6000K might put out the same lumens the 5000K
> > will seem brighter because your eyes can see all the lumens.
> >
> > Peter T.
> >
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