Copper threads

[The Whispering Gallery]

Ok, I have some reasonable CCT results using a Canon T3i in aperture priority (lens was Canon 24 mm, aperture was F/5.6, and ISO was 400). All flashlights were in highest mode, except the MKIII, which was in H2 because it ended up overexposed at the fastest shutter speed. CCT was taken from the center of the beam on a white wall.

A01 (Nichia 219B): 4900K
i3s (XP-G2): 5500K
D25a (Nichia 219B): 4100K
D25a2 (Nichia 219B): 4250K
ZL SC5W OP (XM-L2): 4250K
ZL MKIII NW (XHP35): 4450K
6P incandescent (P60): 3450K


To get an idea of the variation in measured CCT, I took measurements of just the A01 at different shutter speeds (at F/5).

Shutter speed - CCT
1/3200 s - 4900K (just barely on underexposed side of meter)
1/2500 s - 5000K
1/2000 s - 5100K
1/1600 s - 4950K
1/1250 s - 4900K
1/1000 s - 4900K
1/800 s - 4950K
1/640 s - 5000K
1/500 s - 4900K
1/400 s - 5000K
1/320 s - 5050K (just barely on overexposed side of meter)

Average is 4968K, standard deviation 68K.


Tried to get some better photos to show the difference in CRI, but they still didn't look right.

 

[staticx57]

Indeed, it does look like you have a cooler tint than normal. My A01 balances to white in lightroom at around 3700k which is within the realm of the SW40 it is supposed to be.

 

[jon_slider]

Ok, I have some reasonable CCT results… A01 (Nichia 219B): 4900K

Wow, thats High! maukka tested his at 3960k (pic in post 5)

thanks for sharing all your test results