Supplemental UV

guod

Well-Known Member

• May 27, 2014

• #41

check
Typical Normalized Radiant Flux over Temperature
for both leds before buy!

 

Positivity

Well-Known Member

• May 27, 2014

• #42

Uh oh...lol

90% at 50c?

 

stardustsailor

Well-Known Member

• May 27, 2014

• #43

Ooopppsss ...

Not so good thermal ..."behaviour" of the semiconductor ....
Almost as worse as cheap reds ...





Thank you for the tip,Guod !

Cheers !

 

stardustsailor

Well-Known Member

• May 27, 2014

• #44

Positivity said:

Uh oh...lol

90% at 50c?

Click to expand...

The second one goes from 100% to almost ~35% @100°C !!!!

(And the first is ~95-97 % @50C ...)

 

stardustsailor

Well-Known Member

• May 27, 2014

• #45

UV leds have a true problem ...
Semiconductor material thermal stability ...

( And guess which semiconductor material is one of the 'best' for UV leds ?
Who said diamonds are only for ladies ? )



Cheers .

 

stardustsailor

Well-Known Member

• May 27, 2014

• #46

Probably they 've a bunch full of reasons ,for choosing a cement/brick construction with large windows,
rather than a steel ' frame' , ' layered' with transparent glass/polymer panels ...



Cheers.

 

stardustsailor

Well-Known Member

• May 27, 2014

• #47

Red&Blue ......+ WarmWhite ......... + UV ......


+ DeutschTech & Design !

No need for anything else ,really ....

Cheers !

 

canadian1969

Well-Known Member

• May 27, 2014

• #48

SnowDragon came back with a COB price of $350 for a 50 watt module running 360nm. I have asked for smaller COB wattage pricing.

 

Positivity

Well-Known Member

• May 27, 2014

• #49

Interesting 365nm article

http://pcp.oxfordjournals.org/content/51/10/1745.long

 

stardustsailor

Well-Known Member

• Jun 17, 2014

• #50

http://users.ntua.gr/mmakro/UVsource-measurem.pdf


Nice collection of "plant damage " action spectras (especially for UV)
http://i115srv2.vu-wien.ac.at/uv/actionspectra/as_plantdamage/plantdamage.htm

A a really good handbook about light measurements ,in general ...
Very good .

http://irtel.uni-mannheim.de/lehre/...ikel/Alex_Ryer_Light_Measurement_Handbook.pdf

 

canadian1969

Well-Known Member

• Jun 17, 2014

• #51

great stuff, thanks

 

ak84

Member

• Jun 22, 2014

• #52

So, guise... Is the UV 410nm a worthy addition to a grow or do you have to go to the 360nm ones to make a difference?

 

canadian1969

Well-Known Member

• Jun 23, 2014

• #53

http://www.vaughns-1-pagers.com/science/uv-spectrum.htm
410 is plain old voilet
LED panel manufacturers are selling the 385-410 range as UV... waste of money. As I suspect the "far reds" are as well. The first several posts in this thread outline what UV is and how it should be used.