Re: [APD] Rv: DIY reflector

["S. Hieber" <shieber at yahoo_com>]

Mariona notes an important point. There are two things often confused when considering lamp reflectors, namely, reflectance and specularity. Reflectance is how much incident light is returned from the material, whether diffuse, bent, or whatever. Specularity, to put it crudely, is how well the light remains faithful to the original organization, or said another way, the quality of a material the degree in virtue of which incident light is reflected directly. The wrod come from the Latin "speculum" meaning mirror.
.
 I high degree of either refelctivity or specularity does not entail a high degree of the other. How much you get of one is independent of the other.
 
sh
 
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----- Original Message ----
From: Mariano F. Bonfante <mariano_bonfante at hotmail_com>
To: aquatic-plants at actwin_com
Sent: Friday, July 21, 2006 5:02:44 PM
Subject: [APD] Rv: DIY reflector


I have made my own reflector with stainless steel.

http://espanol.pg.photos.yahoo.com/ph/mfbonfante/album?.dir=31fdre2&.src=ph&store=&prodid=&.done=http%3a//espanol.pg.photos.yahoo.com/ph//my_photos

They are used in an open frame, with an HQI pendant. What I notice is that 
plants reacts to the PLL in differnt way that HQI. The internode distance is 
much smaller.

The final photos shows the all lights on condition, and HQI alone condition.

With a luxometer, I have messaure the following gains:

20Cmts
No reflector vs. reflector: 97%
glass mirror vs. reflector: 93%.

40 cmts
No reflector vs. reflector: 79%
glass mirror vs. reflector:  69%

So a plain mirror limited advantages from no reflector, comparing with a 
reflector.

Regards,


Mariano


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