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Excellent. Yes, 1.1 has a pretty significant correction. The problem with version 1.0 was that LER was only being integrated over the PAR range. The problem is, LER is a measure of the maximum theoretical LUMINOUS efficiency, so in order to calculate it you have to consider the entire spectrum...

Wow, I'm excited that somebody is finally putting this tool to good use. With regards to the math.xlsx data; a LER of 251 lm/w is extremely low for a white light source, so low that I'm inclined to believe that it is incorrectly calculated. If you can give me the excel sheet with the...

Thanks @ttystikk ! I'd like to make some edits to version 1.1 in order to increase its functionality and usability. I really like @Rocket Soul suggestion about being able to combine/mix'n'match different spectrum. If anybody has any other suggestions or requests, I'm happy to put the time in...

It is a really interesting question. We obviously need to see more real world grows. I applaud @nevergoodenuf for being on the cutting edge! I have a feeling that we will start to see more people supplementing their "normal" 80CRI lighting with low temperature 90+ CRI lighting, in a similar...

I appreciate the kind words and sorry for being a little late to the party. You've got an awesome setup there and I'm sure you're happy with the results. Very clean, well done. I just wanted others to know that you could still make a great light, using top quality COBs, while cutting out some...

Alright. I like a challenge. Here is "Ganjineer's dirt cheap not complete shit COB build for a cool 2 hundy". CLU048-1212 $13.25 x8= $106.00 https://cobkits.com/product/citizen-clu048-1212-80cri-choice-of-color-temps/ Generic 400w switching power supply $19.11 x1= $19.11...

Check the voltage between the wire hanger and ground on the outlet using a multi-meter. If you have a positive voltage then the case is live but not passing current to ground as it should, which can be a dangerous situation. Also, with the multimeter you can check for continuity between the case...

That would be nice, but high CRI LEDs typically have a lower luminous efficiency than their 70-80 counterparts. So you're potentially losing photosynthetic photons for the benefit of better color rendering to the human eye.

This is really an unknown. By the traditional definition of the PAR spectrum (400-700 nm), most 90 CRI lighting will produce less photosynthetic photon flux per watt than 80 CRI. However, as CobKits stated, it is known that wavelengths over 700 nm have an effect on photosynthesis despite being...

I understand, but I did give you a suggestion. I said you'll get the results you want from an HPS with a cool tube.

Given your up-front cost constraints, dislike of diy, and apathy towards electricity cost I'd say the HPS with a cool tube to help with the heat will be an adequate solution for you. It'll get the job done just like you want. You'll be happy with the results. I will add the caveat that LEDs are...

I'd just like to point out that we've got some great info here in this thread. Thank you for starting this discussion!

LER is the theoretical lumens per watt of a 100% efficient light source with the same spectral distribution as the light you are trying to analyze. It is independent of all other factors except for spectral distribution. A 555 nm monochromatic light source will have a LER of ~683 lm/W. This is...

I've digitized the graph for 3000k 90CRI and threw it in my calculator. Results below...

Yep, the warm white is the one I digitized. I assumed that that was the 3000k. I'm going to try the 90cri as well.

I quickly digitized the spectral distribution. According to my PSQC calculator the CXM-22 3000k 80CRI has a LER of 323 lm/W. This spectrum is identical to the CXM-32 3000k. See the output from the calculator below...

Gives a whole new meaning to growing "fire" weed.

If you want to run the Lucas formula throughout your grow, I've had great success with GH MaxiBloom powder along with some added calmag. It really couldn't be simpler, mix the powder with warm water, throw it in your res, add calmag, and adjust pH. It has gotten rid of all the different nutrient...

Good to know Napalm, let's get to the bottom of this! For an initial test I'm going to determine the effects of the electrolytic cell on pH and PPM in a standard, lucas formula, nutrient solution. My experimental control will be the standard solution with an air stone and pump. For the...

Interesting. What toxic compounds were of particular concern and did he say what the precursors were? The one that I was concerned with was the generation of chlorine from sodium chloride (2 NaCl + 2 H2O → Cl2 + H2 + 2 NaOH). However, the vast majority of nutrients don't contain sodium chloride...