A related query: I was always told that fluorescent lights should be left on all day, because they take a lot of energy to turn on. So, if you're turning them on and off all day when you're entering & leaving the room, aren't you negating any energy savings you might have gained by substituting them for incandescents? IF true, doesn't the same principle apply for the compact fluorescents, too?
-----Original Message-----
From: Museum discussion list [mailto:[log in to unmask]] On Behalf Of Patrick Schmitz
Sent: Thursday, August 23, 2007 6:22 PM
To: [log in to unmask]
Subject: Re: [MUSEUM-L] CFL bulbs
See also this note/response on the Mercury issue in CFL.
http://www.sierraclub.org/sierra/200707/mrgreen_mailbag.asp
Patrick
> -----Original Message-----
> From: Museum discussion list [mailto:[log in to unmask]]On
> Behalf Of American Conservation Consortium, Ltd.
> Sent: Thursday, August 23, 2007 3:12 PM
> To: [log in to unmask]
> Subject: Re: [MUSEUM-L] CFL bulbs
>
>
> Fluorescent technology is the same, whether in straight tubes or
> twisted ones. The phosphors react to an electrical stimulus and
> fluoresce, giving off light. The specific phosphors depend upon
> the formulation chosen by the manufacturer. A greater number of
> phosphors can create a more natural, accurate daylight light, but
> are more expensive. Thus, bulbs are created to meet specific
> needs. All fluorescent bulbs give off UV. It is a natural
> consequence of including blue/violet light in the color spectrum
> of the light. To eliminate it from the natural spectrum of the
> bulb results in a very red light. This is why very little UV is
> present in incandescent light, which is very red in color. To
> determine the amount of UV in different bulbs, request the
> spectral curves for each specific bulb from the manufacturers.
> Some will list the total UV, but on others, you will have to
> compare the curves and deduce the amount.
>
> Filtration is the only effective method of removing the UV. This
> can be a coating put on the bulb by the manufacturer, or with
> sleeves. Sleeves are not an option for twisted bulbs such as
> compact fluorescents.
>
> If your question is "do compact fluorescents represent a greater
> danger to collections than do regular (straight) fluorescents,"
> the general answer is probably not, depending upon the specific
> bulbs in question (assuming equal wattage bulbs). However, if
> the regular bulbs are filtered and the compact fluorescents are
> not, the regular will be safer. So far as I know, both types
> have mercury, or an equivalent, which is required for them to fluoresce.
>
> Marc
>
> ---- Martha Battle Jackson <[log in to unmask]> wrote:
> > Has anyone heard of compact fluorescent lamp (CFL) bulbs being
> harmful to
> > artifacts? Evidently they have mercury, so several of our site managers
> > have questioned whether they should be replacing their regular office
> > fluorescent lighting with CFL lamps.
> >
> >
> >
> > Thanks for your help!
> >
> >
> >
> > Martha Battle Jackson, Curator of Technology
> > North Carolina Division of State Historic Sites and Properties
> > Mailing Address: 4620 Mail Service Center, Raleigh, NC 27699-4620
> > Street Address: 430 North Salisbury Street, Suite 1115,
> Raleigh, NC 27604
> > 919/733-3877; ext. 236; FAX: 919/733-9515
> > [log in to unmask]
> >
> >
> >
> > E-mail correspondence to and from this sender may be subject to the
> > North Carolina Public Records Law and may be disclosed to third parties.
> > The views expressed by the sender may not reflect those of my agency.
> >
> >
> >
> >
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=========================================================
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