dcca

Once again......The light will penetrate futher. MUCH FUTHER. Flours only work when they are like 2 inches away from plants..GET IT? END OF STORY!

powercow9

I really dont think you have to worry about light pen.. as you can suround the plants with fluoros. I think there are plenty of valid arguements for the fluoros over the hps. One of the resons that fluoros lack good light penetration is that the defuse the light rather than be from a point source like a hps. But plants like defused like more than point light (comes from our days in the oceans) Thats why most green houses use a defusing film. So you lose penetraion but gain defusion.

I say the real test is grams per watt... we all try to get close to the theretical 1 gram per watt.. but no one can argue that .5 grams per watt isnt bad.. Thats almost a pound off one 400 watt (hps or what ever) Well here is a fluoro grow where he got a little more than .5 grams per watt.. I 've seen others and better one but this is the one I can find. http://users.lycaeum.org/~npkaye/multishelf.html

Last lumens dont really mean anything. I can give you a 100,000 lumen light that couldn't grow mold, and I can give you a 30 lumen light that can grow the **** out of plants. We need to demand our PAR rating.

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JoseHempSeed

huh??? you say a diffused light source is better for 'penetration', even cite an example of a greenhouse, but say fluorescents aren't ok??? because they are diffuse lighting?

huh??? of course a bright 100k lumen light will KILL mold! you grow mold in the dark for the best results!!!
and i want to see the 30 lumen light that grows ANYTHING (but mold )

like it or not, powercow9, lumens are the standard way to measure light. throughout the entire lighting industry and around the world. and for good reason. par has not caught on because there are LOTS of problems with it, and some botanists just plain won't accept it.

Agent86

Hi Edith.

As you can see lighting is a hotly contested subject around here.
I've been trying out the new Envirolight bulbs & so far I am very impressed.
Below is a link to my envirolight grow journal.

If your curious about compact flos these are the best on the market. In my opinion.

Good luck with your grow & welcome to HC .com

Later Grow Sis.
86.
PS: I attached a pic of one.

Attached Images

light reflector underside.jpg (30.5 KB, 187 views)

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late Bloomer

EVL is being very kind to me. Plant is thick and bushy and is being trained in spiral, should hug EVL. HID are really good for larger area, im in closet.

peace II

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JoseHempSeed

zoomy's right...you really didn't walk into a minefield

it's just that we're all pretty passionate about our lights

good luck with your grow

edith

Thanks for the sympathy guys!! Check my first few posts at the start of this thread. A fairly heavy entry to HC.com!

Hi there dcca. Youve misunderstood me again my friend! The cut and paste of my second post wasnt a repeat of the question but was for firextol ( he wants to smack me ). Been checking out your grow journal...man those are some nice plants. If mine grow a third of yours, ill be a happy bunny!

Cassius, mucho thankos for the light info. Unfortunatly cant post pictures so hope the discription of the freak was good enough. I want to rip it out but my girlfriend wont let me cos she feels sorry for it! lol

Weedchiller's right i think. No EVLs here. Would be getting my 250HPS today but it's bloody bank holiday. Can you smell my impatience...

powercow9

I said nothing about defused light being better for penitration, I said plants prefer defused lighting.


you can it's called an LED. It's made by snap-lite http://www.quantumdev.com/LED_Produc...snap-lite.htmlAnd face it PAR is taking hold. SON agro, sun light systems, and hotilux have adopted the PAR standard. Sure alot of botanists didnt accept it at first but as PAR developed into YPF-par and such more and more accept it. NASA and Biospere used PAR for all their tests.. not one mention of lumens, I wonder why is that?? PAR will never take complete hold while people continue to say Lumens are everything.

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JoseHempSeed

ummmm.....
that thing is not for growing plants...it's for fluorescence and gene research experimentation...it's just a monochromatic light source, not a grow chamber...
there was a variation of this box that was designed for very small plant growth experiments. it had a fluorescent tube in it...

powercow9

Um yes it is. would you like more proof... here is a quote from one of my manuals. Tests to date confirm that LED lighting technologies are plausible alternatives to conventional plant lightingsources. The combination of far-red radiation and higher light intensity boosted by near PAR wavelengths appearedto promote increased growth in the 690 nm LED treatment and then here is NASA growing with nothing but snap-lite LED's.http://pet.jsc.nasa.gov/Reports/Phase3/07_LMLSTP.html. I wish I could send you more Proof I know what I'm talking about but the rest is in book form.

Hell call up the fellows at quantum development and ask them what their LED's can be used for.

PAR isnt the final answer but it is much better than lumens as plants reflect 80% of lumens but absorb 80% of PAR. My problem with PAR is the weight it gives to blue light.. I think we need to split it up (hmm kinda like NASA is doing now) into red PAR and Blue PAR. I think we need to go even further than that. I think we should seperate the far red and the red. why you ask.. cuase a light with a higher red-to-far-red ratio will flower faster than one that has a low red-to-far-red ratio. Also if the far red is more than the red, then short-day plants may never flower at all. but will strech like crazy.

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