Recent content by gammaz

the insulation in your house :lol: If youre really worried you could always try a tin-foil hat too :mrgreen: Now you wont be able to hide the bunker in the backyard, that thing will show up, even if you line it with foil, it will appear as a radar dead spot and the software can model it based...

dude...lux meter, measuring lumens per square meter...if you cant extrapolate, I dont know what else to say. Anyway, its ok if you have a different opinion, Im just making sure people get the scientifically accepted opinions as well :-P

dude...so...wrong... Lux = Lumens per sq meter. Footcandle = Lumens per square foot. Grab one light, get a light meter, read result. Add second light, read new result. Better yet, read this thread https://www.rollitup.org/indoor-growing/83128-lumens-lux-adding-all-up.html

About those See Through Wall radars, heres some more evidence that they dont like metal, from http://pubs.drdc.gc.ca/PDFS/unc36/p518404.pdf "Solid metallic walls are completely opaque to the radar frequencies of interest. The radar signals are completely blocked by a thin aluminum foil such as...

Yes you can add lumens!!! Lumens are a measure of photons, put two lights next to each other, and they both spit out photons onto the same area, resulting in added brightness/lux/luminosity.

If u want a simple way to see the spectrum your light source is putting out, I came across this the other day http://www.cs.cmu.edu/~zhuxj/astro/html/spectrometer.html Dont point it directly at intense light sources, use reflected light off a white surface instead. Unless u like toasted retinas!

hehe this was about 10 years ago :eyesmoke: I never used it for weed so I have no idea how much piping/rootmass it would be good for, but it did put more than enough for my shrooms in a medium sized fishtank. I used a cheap 20 cent in-line valve they sell for the aquarium pumps to control the...

Im not saying one thing is cheaper than the other, Im sayings its irrelevant, and explaining why Lumens are used, in response to "They use lumens to measure light because it is a simple and cheap test and you can compare all lights with this"

Lumens are perfectly fine for comparing plant growth lights of the same spectral output. They use Lumens to measure light because for most purposes, lighting is something that is used to help us humans see things, not becasue it is simple & cheap ;)

Youre right, however, the discussion/arguing actually lets people know what they need to verify ;)

Doing some reading now, see a couple of things, one is UWB 'see through walls' Radar, the other is a 'see through walls' Motion Tracker. Niether is a Thermal Imager as far as I can tell, so they wouldnt have any obvious 'glows' to randomly pick you up on. A motion tracker only tracks movement...

In medical applications right? Where you dont need a great deal of penetration? It makes it safer to use waves with less energy.

gamma and x rays? :lol:

heres a very similar design I made for my mushies, instead of fan uses aquarium pump.

This is what I used to pump mist to my shrooms