Return to the thumbnail page Display/hide file information See previous file See next file

Sylvania MH

Sylvania MH

Click to view full size image

My new 70w Sylvania MH lit in the tester cobrahead.

IMG_20180822_150026859~2.jpg IMG_20180816_191731352_HDR.jpg IMG_20180816_125803674_HDR.jpg IMG_20180808_211356182_HDR.jpg

File information

File information

Download: Download this File
Filename:IMG_20180816_125803674_HDR.jpg
Album name:wattMaster / Our Bulbs + Fixtures
Keywords:Lamps
File Size:440 KB
Date added:Aug 16, 2018
Dimensions:2464 x 1848 pixels
Displayed:81 times
Date Time:2018:08:16 12:58:05
DateTime Original:2018:08:16 12:58:05
Exposure Bias:0 EV
Exposure Time:1/20299 sec
FNumber:f 1.8
Flash:No Flash
Focal length:3.95 mm
ISO:100
Make:motorola
Model:moto g(6)
Software:ali_vzw-user 8.0.0 ODS27.104-31-2 2 release-keys
White Balance:0
URL:https://www.lighting-gallery.net/gallery/displayimage.php?pos=-149750
Favorites:Add to Favorites
Comments
Lumex120
Hero Member
*****
Offline

Gender: Male
Posts: 1451
View Gallery

105555521242365640724 UCM30tBQDUECOV6VeG5W87Vg zfarmadillo
View Profile Personal Message (Offline)
Aug 16, 2018 at 12:00 PM Author: Lumex120
Good to see that it arrived intact. And wow, this is a good photo. How do you like this?

Any machine is a smoke machine if you operate it wrong enough.

wattMaster
Hero Member
*****
Offline

Gender: Male
Posts: 2005
View Gallery


View Profile WWW Personal Message (Offline)
Aug 16, 2018 at 12:06 PM Author: wattMaster
It seems a little warmer compared to my other MH, but I really like its color.

SLS! <click

BlueHalide
Sr. Member
****
Offline

Posts: 371
View Gallery

View Profile Personal Message (Offline)
Aug 16, 2018 at 07:10 PM Author: BlueHalide
These are rated at 3000k and have a different fill chemistry than the ubiquitous 4000K lamps we all know. Sylvania only makes the medium base 70w and 100w in this 3000K color, and all have an explosion jacket as they are very prone to rupture at EOL due to the high sodium and lithium content. The CRI is surprisingly bad (in the lower 50's) in these lamps, which is why I prefer warm white ceramic MH over these.
Lumex120
Hero Member
*****
Offline

Gender: Male
Posts: 1451
View Gallery

105555521242365640724 UCM30tBQDUECOV6VeG5W87Vg zfarmadillo
View Profile Personal Message (Offline)
Aug 16, 2018 at 07:17 PM Author: Lumex120

These are rated at 3000k and have a different fill chemistry than the ubiquitous 4000K lamps we all know. Sylvania only makes the medium base 70w and 100w in this 3000K color, and all have an explosion jacket as they are very prone to rupture at EOL due to the high sodium and lithium content. The CRI is surprisingly bad (in the lower 50's) in these lamps, which is why I prefer warm white ceramic MH over these.

Yea, I noticed the bad CRI when I first got these. I really don't like the color that much to be honest.

Any machine is a smoke machine if you operate it wrong enough.

dor123
Hero Member
*****
Offline

Gender: Male
Posts: 2537
View Gallery
Other loves are computers, office equipment, A/Cs


View Profile WWW Personal Message (Offline)
Aug 16, 2018 at 10:39 PM Author: dor123
I think the CRI of Na-SC, shouldn't change with the different color tempreatures.

I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

Max.
Newbie
*
Offline

Posts: 49
View Gallery


View Profile Personal Message (Offline)
Aug 17, 2018 at 01:13 AM Author: Max.

I think the CRI of Na-SC, shouldn't change with the different color tempreatures.

But it does to some extent as the spectral power distribution of the emitted light changes at different light color temperatures. This change in CRI is even stronger when additives such as thallium, lithium or indium are used (which is quite common in compact low-wattage NaSc lamps aimed at shop and retail lighting applications).

@ Bluehalide - is the CRI of compact 3000K NaSc lamps that low? In my experience it is in the 70s Ra8 on account of the enhanced red emission from the discharge. 50s Ra8 means that there's something quite wrong with the lamp and/or the system (or are you talking about cheap Chinese lamps?). In any case, I agree that the light color from CMH lamps is far better in comparison.
BlueHalide
Sr. Member
****
Offline

Posts: 371
View Gallery

View Profile Personal Message (Offline)
Aug 17, 2018 at 12:37 PM Author: BlueHalide
@max I just looked up the CRI spec of the lamp above, Sylvania claims a CRI of 65, which is about the same as other Na-Sc lamps of 4000K, so I stand corrected. I remember reading somewhere these had a CRI of 55, but I may have misread it. However, the color rendition appears lower than 4000K lamps, the blues and greens are much more subdued and less vibrant under this lamp when compared to 4000K lamps
Max.
Newbie
*
Offline

Posts: 49
View Gallery


View Profile Personal Message (Offline)
Aug 17, 2018 at 03:14 PM Author: Max.
I also checked my literature for data related to this particular MP70/U/Med, and I find a CRI specified at 75 Ra8 for the 3000 K model, both in Sylvania's 2003 Product information and specification guide (Metal halide lamps), and in OSI's 2015 general catalog. I don't know if Sylvania has since changed the characteristics of its compact QMH lamps, but the color quality is definitely better than that of standard 4000 K NaSc lamps. Of further interest, the CRI for the 4000 K variant of this protected 70 W Metalarc is rated at 80 Ra8, certainly thanks to an extra additive in the burner, such as thallium iodide. This lamp was no longer listed in the 2015 catalog though (but the unprotected version still was, and it has a slightly lower CRI of 75 Ra8).
© 2005-2019 Lighting-Gallery.net | Powered by: Coppermine Photo Gallery