LivingDread
Registered on
Sep-26-2007
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Message #43721 posted by LivingDread (Info) September 30, 2007 04:36:44 ET
In Reply to: Re: DIY led grow lights posted by sanclem (Info) September 29, 2007 22:02:51 ET
i have done my homework, and have some responses to your reply...
Sanclem said: "There some that use a pulsed with amp."
is this referring to the technique of overpowering a 450nm led at a rate of 1 microsecond on and 200 microseconds off, to create a 400nm led that wont burn out as fast? that wont be a problem because InGaN leds are now cheap and availiable, and i wont have to bother overpowering a led with microsecond accurate timing.
Sanclem said: "Now NO ONE has any production numbers, so it worthless till anybody comes up with numbers."
that is a little hasty, i have seen people growing with these on youtube, remember? they were growing good herb, so i dont think it is completely worthless, though you could argue it is a calculated risk
Sanclem said: "Note NASA uses florsent panels for there space growing.
Now if you have more how to then they do and a bigger budget go for it."
Sarcastic? Hostile? Just plain wrong? forgive me if i am wrong, but i believe the answers to those questions are yes, yes, and yes. actually i got some good info from NASA regarding shorter wavelength Indium-Gallium-Nitride LEDs before i even came to this forum. info says that NASA has been using red leds for a while, and have been using blue since 2004 apparently.
Sanclem said: "Now remember that that a led is extreely narrow spectrum and narrow beam angles, AND distance is the inverse square of the output."
are you making that inverse square thing up? seriously though, i think that equation is for conventional lights, led's surely use a different formula? LED's are available with several different lens types, i haven't picked what i am going to use yet, but i am confidant that i can get good to great coverage by:
1. creating multiple breadboards that can be placed over, around and underneath the plant.
2. bringing the lights even closer (no heat, not a problem[okay, 15 degrees above ambient, but the plants could handle that, not a problem])
3. picking the right type of lens for my project
4. take advantage of narrow spectrum, and don't pay for light i am not going to use.
Sanclem said: "There lots of people that make led displays , but NONE have any plant output data. Thats only been a few years of trying. High output overdriven leds out there at $3 each."
correct, people that make led displays do not have any plant output data, maybe it is because they are too busy displaying something with their LEDs? the 400nm LEDs might run as high as $3, but regular blue and red are dirt cheap.
Sanclem said: "Funny that a 40 year old florsent system still wins."
agreed, lets replace it with something better.
Sanclem said: "Now sound is a vibration of lower freq's 200-18k hertz and light is way up there Gig ??? herts (that alone is goning to cost $$$$. Broad band sweep gen do not come cheap, with a good sinking . So I would guess you would need to build a inverse driver to fill in the freq's
Now (2) 6328 ang light 180 deg off produce twice as bright 6328 ang. not 12656 ang. If you use a meter that takes in to account the loses of (mind went blank on they root meter needed).7??) pulse weighing meter"
i admit it, you lost me... was it in response to the part about stacking waves? because i already figured that out in a way i do understand...
Sanclem said: "Have fun with DEAP Pockets and enjoyment of trying something."
somehow i don't feel that you expect me to "Have fun." what do you mean by dead pockets? are you referring to any area where i don't have light?
Sanclem said: "I see the light , ZAP dead bug."
no comment, other than my grow room will be properly sterilized and free of vermin and pests
sorry if i come off defensive but your reply felt decidedly hostile. perhaps i just misread the tone because of the informal grammar you use. i promise to maintain a civil tone if we can make it a two way street. there is really no need to get hot over this.
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