Re: N:Vision CFL's

[Marc_F_Hult <MFHult@xxxxxxxxxxxxxxxxxxxxx>]

On Sat, 24 Mar 2007 05:42:11 -0400, "Robert Green"
<ROBERT_GREEN1963@xxxxxxxxx> wrote in message
<7JidnR3oxIIFb5nbnZ2dnUVZ_qLinZ2d@xxxxxxx>:

[Mercury discussion unrelated to subject deleted]

>There are lots of competing claims, the most interesting among them being
>CFL equivalency ratings are overblown.  A poster to the discussion at
>wikipedia says that his tests show that CFL's claimed to be equivalent to a
>100W lightbulb are actually noticeably dimmer.  This is something I mean to
>test since I "scored" a number of the N-Vision CFL's at Home Depot tonight:

How many watts does your refrigerator use? We were treated to hundreds and
hundreds of lines of posts on this topic with lottsa discussion. Follow-up?
Summary? Results?

>I'll have to dig out my Gossen Luna Pro lightmeter so I can
>make some meaningful measurement if the CHA research committee stipulates it
>to be accurate enough for the purpose!  (-:

Spectral response of the meter is important esp wrt fluorescents. The spectra
of  5500K and 3500K n:vision compact fluorescents are here:

http://ledmuseum.home.att.net/spectra7.htm

Using a Zone VI-modified Pentax spotmeter, in a windowless bathroom with
off-white walls, in 1/3 stop increments relative to incandescent,  I
measured:
                                 Incident   Reflected    Reflected
				 on axis,   off wall,    off wall,
                                 1 minute   ~5 seconds   1 minute warmup
GE 60 watt 820(?) lumen incand.      0        0             0
n:vision Soft White ~2700K           +1       0            +1
n:vision Bright White ~3500K	     +1       0            +1
n:vision Day Light ~5500K 	     +2       -2           +2


Each of the CFLs puts out more light than the reference 60 watt incandescent
when warm.

The warmup period for the 2700K and 3500K is completely negligible starting
from room temperature (I previously posted data showing rapid warm-up
starting at 0F (-18C)).

As the physics would suggest, the 5500K takes longer to warm up. But it is
both perceived and measured as brighter. Both of these "higher" measurements
might be the results of the spectra and meter and eye sensitivities.


HTH ... Marc
Marc_F_Hult
www.ECOntrol.org