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Date: Thu, 17 Mar 2011 20:01:58 -0500
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Janet Baum <baum.janet**At_Symbol_Here**GMAIL.COM>
Subject: Re: Light illumination in laboratories
In-Reply-To: <D48D30642A3FFE42AE78EB6C3279A807016C8A90415E**At_Symbol_Here**dl-exchms-05.dairydata.local>
Dear Mike, Yes, that range is industry standard. However many factors
influence the perception of "adequate lighting". Among the factors is the
reflectance of room and benchtop surfaces. Black surfaces absorb light and
even if you put a light meter on the surface, it measures 100 fc, many
scientists would say it's still too dim. It's perception, not the amount of
light hitting the countertop. If surfaces are light colored, there is
reflectance adding to the perception of good quality light. Another strategy
for optimizing the perception of light is to provide up light, toward
ceilings with some reflectance value, in addition to normal down light. The
more the light bounces around a room, normally that improves distribution,
reducing glare and hot spots.
Another factor is the color of light. 5500 K at >90% CRI simulates
"daylight" and is very satisfactory for most people. These are just a few
hints for you to investigate to achieve good lighting in laboratories.
On Thu, Mar 17, 2011 at 10:02 AM, Reuter, Mike - Dairy One <
Mike.Reuter**At_Symbol_Here**dairyone.com> wrote:
> All,
>
>
>
> The question came up recently at our laboratory; Are there any specific
> regulations regarding required or even recommended light intensities in foot
> candles for analytical labs?
>
>
>
> The only thing I could come up with at the moment was in the *Handbook of
> Chemical Health and Safety* by Robert J. Alaimo. It recommended that the
> light intensity at the bench for typical chemistry labs to range between
> 80-100 foot candles.
>
>
>
> Any input would be greatly appreciated.
>
>
>
> Thanks,
>
>
>
> Mike
>
>
>
> *Michael J. Reuter*
>
> *Forage Laboratory Chemist*
>
> *Health and Safety Director*
>
>
>
> *Dairy One*
>
> *730 Warren Road*
>
> *Ithaca**, **NY** **14850*
>
> *Phone 1-607-257-1272, ext. 2166*
>
> *Fax 1-607-257-1350*
>
> *email **mike.reuter**At_Symbol_Here**dairyone.com*
>
>
>
Dear Mike, Yes, that range is industry standard. However many factors influ
ence the perception of "adequate lighting". Among the factors is
the reflectance of room and benchtop surfaces. Black surfaces absorb light
and even if you put a light meter on the surface, it measures 100 fc, many
scientists would say it's still too dim. It's perception, not the a
mount of light hitting the countertop. =A0If surfaces are light colored, th
ere is reflectance adding to the perception of good quality light. Another
strategy for optimizing the perception of light is to provide up light, tow
ard ceilings with some reflectance value, in addition to normal down light.
The more the light bounces around a room, normally that improves distribut
ion, reducing glare and hot spots.
Another factor is the color of light. 5500 K at >90% CRI
simulates "daylight" and is very satisfactory for most people. Th
ese are just a few hints for you to investigate to achieve good lighting in
laboratories.
On Thu, Mar 17, 2011 at 10:02 AM, Reuter, Mi
ke - Dairy One
<Mike.Reuter**At_Symbol_Here**dairyone.com> wrote:
All,
=A0
The question came up recently at our laborat
ory; Are there
any specific regulations regarding required or even recommended light
intensities in foot candles for analytical labs?
=A0
The only thing I could come up with at the m
oment was in the
Handbook of Chemical Health and Safety<
/span>
by Robert J. Alaimo.=A0 It recommended that the light intensity at the benc
h
for typical chemistry labs to range between 80-100 foot candles.
=A0
Any input would be greatly appreciated.
=A0
Thanks,
=A0
Mike
=A0
<
span style="font-size:7.5pt;font-family:"Comic Sans MS"">Michae
l J. Reuter
<
span style="font-size:7.5pt;font-family:"Comic Sans MS"">Forage
Laboratory Chemist
<
span style="font-size:7.5pt;font-family:"Comic Sans MS"">Health
and Safety Director
=A0
<
span style="font-size:7.5pt;font-family:"Comic Sans MS"">Dairy
One
<
span style="font-size:7.5pt;font-family:"Comic Sans MS"">730 Wa
rren Road
<
span style="font-size:7.5pt;font-family:"Comic Sans MS"">Ithaca
,
N
Y
=A0
1
4850
<
span style="font-size:7.5pt;font-family:"Comic Sans MS"">Phone
1-607-257-1272, ext.
2166
<
span style="font-size:7.5pt;font-family:"Comic Sans MS"">Fax 1-607-257-1350
<
span style="font-size:7.5pt;font-family:"Comic Sans MS"">email
mike.reuter**At_Symbol_Here**dairyone.com
=A0
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