refection question
- Thread starter johnny781
- Start date
gunnar&carey
Well-Known Member
Thats what i did flat white if u need more light maybe add a small cfl thats what im doing for my lower leafs
Hugo Phurst
Well-Known Member
I found them a pain in the ass, tear easily etc., go with the white paint.
polo the don
Well-Known Member
Flat white paint. Simple, cheap, and effective.
RM3
Well-Known Member
A lesson for ya 
Ever read the debate over Mylar or Flat white paint ? which is best and why?
here is a very deep look into it that most growers are unaware of,,,
most growers only look at reflective properties ,,,
Mylar: 90% to 95%
Flat White Paint: 85% to 93%
Semi Gloss White Paint: 75% to 80%
Flat Yellow Paint: 70% to 80%
Aluminum Foil: 70% to 75%
Flat Black Paint: less than 10%
with the best flat white paint being Titanium Dioxide
most growers do not consider refraction or diffusion properties but these do matter somewhat
The refractive index of Mylar is 1.5 ~ 1.52
from here,,,
http://www.cidraprecisionservices.co...yethylene.html
The refractive index for Titanium Dioxide is 2.55 ~ 2.73
from here,,,,
http://www2.dupont.com/Titanium_Tech...s_Brochure.pdf
and then there is the thing that no growers consider Emissivity
the definition of Emissivity is ,,,
Emissivity is defined as the ratio of the energy radiated from a material's surface to that radiated from a blackbody (a perfect emitter) at the same temperature and wavelength and under the same viewing conditions.
a basic primer for Emissivity can be found here,,,
http://www.electro-optical.com/eoi_p...Is+Emissivity?
The Emissivity of Mylar is .59
The Emissivity of Titanium white paint is .92
from here,,,,
http://www.electro-optical.com/eoi_p...of%20Materials
This is why the Leprechaun uses flat white paint
Ever read the debate over Mylar or Flat white paint ? which is best and why?
here is a very deep look into it that most growers are unaware of,,,
most growers only look at reflective properties ,,,
Mylar: 90% to 95%
Flat White Paint: 85% to 93%
Semi Gloss White Paint: 75% to 80%
Flat Yellow Paint: 70% to 80%
Aluminum Foil: 70% to 75%
Flat Black Paint: less than 10%
with the best flat white paint being Titanium Dioxide
most growers do not consider refraction or diffusion properties but these do matter somewhat
The refractive index of Mylar is 1.5 ~ 1.52
from here,,,
http://www.cidraprecisionservices.co...yethylene.html
The refractive index for Titanium Dioxide is 2.55 ~ 2.73
from here,,,,
http://www2.dupont.com/Titanium_Tech...s_Brochure.pdf
and then there is the thing that no growers consider Emissivity
the definition of Emissivity is ,,,
Emissivity is defined as the ratio of the energy radiated from a material's surface to that radiated from a blackbody (a perfect emitter) at the same temperature and wavelength and under the same viewing conditions.
a basic primer for Emissivity can be found here,,,
http://www.electro-optical.com/eoi_p...Is+Emissivity?
The Emissivity of Mylar is .59
The Emissivity of Titanium white paint is .92
from here,,,,
http://www.electro-optical.com/eoi_p...of%20Materials
This is why the Leprechaun uses flat white paint
Sativied
Well-Known Member
A hypothetical perfect mirror has an emittance equal to 0.0.
Emittance of human skin is nearly 1.0.
Higher is not better in this context. Emission is inverse proportional to reflection and proportional the absorption.
Good reflectors are poor emitters. Good emitters are poor reflectors. With the best emitter and the worst reflector being the hypothetical blackbody that absorbs all from every wavelength and direction. There's no free energy.
^^ISS
^^NASA
Also, with a proper hood and light you already have plenty of diffusion, the purpose of reflection is to control the path of the light, essentially extending the hood. Although I do agree some diffusing along the way can beneficial.
johnny781
Member
Ic yeah idk I have flat white paint and it just looks dull compared to when I had tin foil up but I found the tin foil acted like a ray gun lol it put burn holes in the leafs but it just looks so dullA lesson for ya
Ever read the debate over Mylar or Flat white paint ? which is best and why?
here is a very deep look into it that most growers are unaware of,,,
most growers only look at reflective properties ,,,
Mylar: 90% to 95%
Flat White Paint: 85% to 93%
Semi Gloss White Paint: 75% to 80%
Flat Yellow Paint: 70% to 80%
Aluminum Foil: 70% to 75%
Flat Black Paint: less than 10%
with the best flat white paint being Titanium Dioxide
most growers do not consider refraction or diffusion properties but these do matter somewhat
The refractive index of Mylar is 1.5 ~ 1.52
from here,,,
http://www.cidraprecisionservices.co...yethylene.html
The refractive index for Titanium Dioxide is 2.55 ~ 2.73
from here,,,,
http://www2.dupont.com/Titanium_Tech...s_Brochure.pdf
and then there is the thing that no growers consider Emissivity
the definition of Emissivity is ,,,
Emissivity is defined as the ratio of the energy radiated from a material's surface to that radiated from a blackbody (a perfect emitter) at the same temperature and wavelength and under the same viewing conditions.
a basic primer for Emissivity can be found here,,,
http://www.electro-optical.com/eoi_p...Is+Emissivity?
The Emissivity of Mylar is .59
The Emissivity of Titanium white paint is .92
from here,,,,
http://www.electro-optical.com/eoi_p...of%20Materials
This is why the Leprechaun uses flat white paint
Hugo Phurst
Well-Known Member
Got the money for a tent?
johnny781
Member
Nah kind of on a budget so far I've spent 40 bucks on the whole grow just for nutes and ph up &down. . & a test . And 5 gal buckets the rest I collected or I had or. Five fingered it
johnny781
Member
Oh and built right now I'm wOrking on my drying chamber
johnny781
Member
But I can't figure on weather or not or exhaust out the bottom for drying or out the top and air holes on the other end