Search results

Thank u for your answer What I do is similar (I think) I measure the area under the curve every 5 nm, then I divide by the whole area The difference may be due to my interpolation of the CIE curve here are my results (It's in french but it's easy to translate) I'll try to calculate these LER...

Hi , I've calculated several LERs to but with 5nm resolution, because I don't have the luminosity curve, or its equation I've only the number every 5nm So, i've found 320-325 lm/w for the most of the White Leds (instead of your 340) How do you do to integrate your curve with 1nm resolution...

Hi, I think we have to clarify some points -Heat, It depend on what kind of Leds you buy Some Cheap Leds, whose efficiency nearly 20-30%, give out to much heat, more than HPS But the last cree Leds, with an efficiency of 40-50%, produce half heat -power consumption As I said, Some Leds have a...

Hi speedy, I approve the choice to add a fan, Cheap leds produce too much heat Remember that lumens are not necessarily a good way to compare Let me ask you a question: In case you would use cree leds, why did you choose the XT-E ? How do you calculate the mW/W ? Have you got the spectrum of...

Of course you could divided the three V-C-F values by the power consumed, however you need an accurate voltage to get a real radiant flux efficiency Anyway, Datasheets are shitty, even the graphs are inexact. V-C-F values or radiant flux efficiencies whatever, I don't think that it will...

I prefer The radiometric efficiency to watts/region. It's more accurate, then you could know the efficient of your LED and of course its spectrum. It's good enough whith your knowledges in science you make your own spectrum and you've got a great panel Of course it need some mathematic tools to...

It's easy to calculate what you want, I mean Watts/Region with Data spectrums ( if these spectrums are not far from truth ) But constructors could give us these data much easily

Sorry but I was talking about luminous power, not consumed power make the assumption that XP-G2 have a radiometric efficiency of 100% ( 100% of electrical energy is changed in luminous energy) ,it will give you the lm/w (luminous watt) wich depend only on spectrum multiply this lm/w(luminous)...

In the datasheet there are the spectrums of each led y axe : relative power(or energy) distribution X axe : wavelength I think that you know this, but why is it not good enough for you? with this base you could calculate what you want Par lumen is a kink as black white

First, I love the end of this text :mrgreen: Then, I agree , I don't use lm/w Kelvin ... they are useless I proceed like that: -I make my spectrum, considering absorption and colours ratio ( after long enquiries ) -I search what kind of LED could result in this spectrum, and define the leds...

I agree and disagree, The warmer the color the lower the radiometric efficiency, however Lm/w (luminous watt I mean) could be higher in warm white than cool white, it's the case for XP-G2 as instance : near to 310lm/w at 100% output Cool white near to 330lm/w at 100% output Warm white based on...

I agree with this, but it depends of the proportions. What I mean is : does a poor quantity in orange-yellow range cause grow trouble ? The MK-R (that i will use in my panels) might be 200lm/w but don't peak at 660nm, as you said, you have to add some 660nm led . So your panel don't draw...

I see, lumens could be significant or not, it depend on what kind of light you compare sometimes you don't know if your HPS draw more lumens than others because its radiometric efficiency is higher or if its spectrum is more green ( as instance) lm/sq ft could be used only with HID I think...

:hump: W/R Leds is the best choice (I think ) Lot of DIY lights are made with this kind of spectrum and it works fine, it seems

Yes, I did it. I don't understand, what do you mean?

It may be true, yellow range could have a great impact on MJ flowering. But we have no proof, or even arguments ( I mean scientific )

What JMD says isn't incorrect First, 1watt (luminous power) of 550nm green give 683lm 1 watt of 450nm blue give 31lm the human eye is not a plant... and "lumens are a way to quantify in relation how well the human eye sees it" according to JMD, I agree Then a 150w CFL is a 100w light...

I agree with Iloveplant about the 730nm diode, I think that IR should be used only at the end of the day cycle This spectrum seems good to, but there is too blue light in my opinion It's a good spectrum for veg, but in flowering the buds could be a little thin I think that it may be better...