How many?!? LED light question

[bombbudpuffa]

How many of these would I need per plant? I just bought one then thought "dang, do I need more than 1 for 1 plant?"

 

[Stoney Bud]

How many of these would I need per plant? I just bought one then thought "dang, do I need more than 1 for 1 plant?"

It says it's only 65 lumens.Light Output
> 65 Lumen



If you take the 3,000 lumens per/sq ft of plants, 65 lumens isn't going to get you very far man.

If the light was at 1" from the plant maybe...

I'd like to see the results you get using this light.

 

[bombbudpuffa]

If you take the 3,000 lumens per/sq ft of plants, 65 lumens isn't going to get you very far man.

Hey Stoney. I don't think that equation works for leds. I think you measure them in something called MCDs(???) like you don't measure the light color of leds by kelvin but nanometers(???). Now, i'm not positive about this. I just think I read that somewhere, that you don't go by lumen output.

 

[JerseyFreshB]

I'm interested.... If you can find the info again I'd like to read it

 

[bombbudpuffa]

LEDGrowLights provide a higher fraction of light in the peak areas of the spectrum of chlorophyll absorption. You should use enough LED lighting to produce 30% of the lux or ft-cd levels produced by metal halide lights, or 25-35% of the wattage per square foot you are using for MH lighting.

Heres a link.

 

[bombbudpuffa]

I'd need around 5 of these imo to do anything substantial.

 

[Stoney Bud]

Hey Stoney. I don't think that equation works for leds. I think you measure them in something called MCDs(???) like you don't measure the light color of leds by kelvin but nanometers(???). Now, i'm not positive about this. I just think I read that somewhere, that you don't go by lumen output.

Plant lumens are very close to human sight lumens. The lumen measurement is the amount of light that strikes a globe at exactly one foot distance. This is the method used by the lighting industry to express light output.

LED's are a more efficient method of lighting, but the output in plant lumens would be the same to the plant regardless of the source of the light.

I can see now that I'm going to have to knuckle under and research the light measurement of LED's in regards to plants.

NASA is doing a major study on this. I'll get back with you on what I find, man.

I'm seeing major grow rooms with LED's in just a few years...

One of the engineers that works with me has about 100 books on lighting. I'll wade through some of them and see if I find anything that pertains to LED's. I doubt it, cause most of it is about industrial lighting...

 

[bombbudpuffa]

I'm seeing major grow rooms with LED's in just a few years

I'm going to invest around $75 in leds. If all goes well you may see one in a few months! Tax time is coming baby!!!

 

[bombbudpuffa]

I'd need around 5 of these imo to do anything substantial.

Uhhh...make that 25...lol.

 

[Stoney Bud]

I'd need around 5 of these imo to do anything substantial.

25-35% of the wattage per square foot you are using for MH lighting.

If your light puts out 65 watts, then you have 16.25% of the light of a 400 watt HID. If you need 35% to match, then you need 140 watts of LED's to come to that. That would be two of them. That would cover the same sq ft as a 400 if his calculations are accurate. However, the all-blue spectrum should be amended with some reds.

Don't take this to the bank yet. I have to get into this more.

 

[Pot Belly]

Hey - those things are NEAT! I want one, or two, or three......... The price is high, but I bet in 5 years, more and more LED grow lights will be used as the price for these lights comes down.

The heat issue (or lack of it) is a major plus for these lights.

 

[bombbudpuffa]

then you need 140 watts of LED's to come to that.

The ones in the link are 4.5 watts. I'd need quite a few of them.

 

[octobong007]

the ones your looking at have a colored filter over them...if they work as good as these... finding the right filter would be most easiest way to build a colored board with clear lights. since that filter only lets thru "blue" light (for vegitation), should be able to come up with stronger lights. just a thought. if that dont make sense, i understand there may reasons it dont. this light is red by the way. :48: back to you bro

 

[JerseyFreshB]

Hey BBP, are you going to be using all LED's or are you going to use LED's as supplemental lighting?

 

[bombbudpuffa]

Hey BBP, are you going to be using all LED's or are you going to use LED's as supplemental lighting?

Looks like supplemental but we'll see. Like I said, i'm going to experiment with a few first. May be a lil down the road before I get to it. I still have to veg under a halogen to show it can give good results(forgot who I promised)first. I'll keep everyone updated because I am a cultivation junkie so who knows.

 

[Rdrose]

From what I read on that website, seems to me that my 400w HPS system that I just ordered may be obsolete fairly soon...

Also, the enhanced output blue might be a good supplement to the 400w system????? If I'm reading this right...

 

[Runbyhemp]

Lookin forward to see how you get on B, been looking at LED's myself.

 

[bombbudpuffa]

These are the colors you should buy if you're looking into these also-660/630/470/420nm. The 600s are red and the 400s are blue. 660 and 420 being the best.

 

[BluntFullOfKush]

yo bbp i seen this and thought you might be intrested in it.....http://www.htgsupply.com/growlighttypes.asp?categoryID=1&subcategoryID=168

 

[That crazy vancouver guy]

yo bbp i seen this and thought you might be intrested in it.....http://www.htgsupply.com/growlighttypes.asp?categoryID=1&subcategoryID=168

I think I'm gunna order me up some of those soon

that's the cat's a-- , those LED spotlights :hubba: