Imformation oberload
- Thread starter Shadrock15
- Start date
Mirrors don't absorb light! Mirrors reflect light, that is why you see your reflection!
Rather than glass mirrors, use Panda film, white paint, aluminum foil etc.
cree, vero, citizen, quantum boards and strips are all good. 200-250 watts at 3000 or 3500k is very good.
most mirrors are actually not that good of a light reflector as people think.60% sounds typical of an average cheap home mirror
regardless they belong on the ceiling of your bedroom not in a grow room
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BK_201
Member
Agreed
Domzy4
Member
I guarantee tat you are goin to be blown away from the light. a 3x 2.5 is ideal for a 260w QB kit. I have a 2.8x2.8 tent and its killa!
Mirrors belong on ceiling....Mirrors don't absorb light! Mirrors reflect light, that is why you see your reflection!
Rather than glass mirrors, use Panda film, white paint, aluminum foil etc.
cree, vero, citizen, quantum boards and strips are all good. 200-250 watts at 3000 or 3500k is very good.
Humple
Well-Known Member
This might be a "too much information" story, and it's certainly off-topic, but when my wife and I were much younger and newly married, we found a long, short dresser with a mirror top at a thrift store. It was a hideous-looking thing, with beat-up, fake velvet upholstery covering every square inch but the mirror top. We bought it anyway, for the sole purpose of getting busy on that mirror top. For some inexplicable reason we thought we'd be able to climb on top of it and look down at ourselves going at it. It weighed about a million pounds and didn't fit in with anything else in our house, but we lugged it home and put it in our bedroom. Then we discovered that lying on top of a mirror doesn't exactly give you a view of what's going on. We felt like idiots. I tell you, the young-and-horny don't shop any smarter than a hungry person at a grocery store. Fucking ridiculous - figuratively and literally. Of course, because it was such a bitch to haul, it stayed in our bedroom for a couple of years, a complete eyesore.
nfhiggs
Well-Known Member
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Ridiculously incorrect. Modern mirrors are made from vapor deposited aluminum, which has a 95-97%% reflectivity. In fact, its the EXACT same substance that gives mylar its reflectivity. The only difference is, it's deposited on a flat planar surface that makes the refection coherent - and NO, it does not "make the wavelength wider". And before you say "but the glass..." - the glass it passes through does not absorb much either - clear plate glass has anywhere from 88-91% transmittance of visible light.
so a two way pass through the glass loses 24-18%.
and then it loses another 5-3% on reflectivity ... but remember most consumer mirrors only have to be good enough to say mirror mirror on the wall whos the fairest of them all.... so change that to 10-6%
and the it loses another 5-10% cause of dirt overspray mites neglect etc,
well guess what ... that's already 39% .....
nfhiggs
Well-Known Member
Notice how hard you had to work to stretch that out to 39%. We went from "40% to 60% if your lucky" to at least 61% using the worst factors plus tossing the kitchen sink in. Now let me tell you the mistake you made - you know that 88%-91% transmittance number... do you realize almost all of the 9-12% transmittance loss is not from the glass absorbing the light, its from the front surface reflection? Glass will actually transmit 98% with just a few anti-reflective coatings. So you need to knock that "24-18%" down to roughly 4%... Suddenly 80% reflectance looks like the worst possible case doesn't it?.
CobKits
Well-Known Member
which in and of itself is... reflection for our purposes
also glass mirrors are quite a bit easier to clean than mylar
CobKits
Well-Known Member
email is 1000x better
BK_201
Member
Sure, what’s the address, or do you want me to email your site?