Did someone post on a thread that 315 Watt CMH cut a week out of veg?

[wietefras]

Yes, it is more intuitive for the purposes I keep listing. You keep forgetting to list the pros when you weigh the advantages. As a consumer, I want to know how much light energy I will need, how much electrical energy that will take, how much heat energy I will have to deal with, and how much that will cost. Power and efficiency quickly tells me this.

It's not more intuitive to use a made up metric and it still tells you nothing.

We determine plant needs by average PPFD. If you like 800umol/s/ then you simply multiply the square meters by 800 and divide by the PPF of the light. It doesn't get any more "intuitive" and fast.

For a vague indication you might as well use lumen/lux instead of pwoer/efficiency. Lumen is just as (in)accurate in measuring what the light does for the plants as efficiency. Both lumen values and efficiency/power ratings can be about 5% off for white leds. It gets worse from there for a spectrum which deviates from "white".

Cambridge Dictionary: accurate adjective

UK /ˈæk.jə.rət/ US /ˈæk.jɚ.ət/

correct, exact, and without any mistakes:

an accurate machine
an accurate description
The figures they have used are just not accurate.
Her novel is an accurate reflection of life in Spain.
We hope to become more accurate in predicting earthquakes.

Power and efficiency do NOT accurately predict the effectiveness of the light on the plants. It's up to 75% off!

But I guess that anyone with a brain gets this by now. You just keep on being the sole cool guy who uses "power".

 

[mytwhyt]

I guess there is a huge generation gap when you don't keep up to the current tech expressions....All i can remember is a mole was something you didn't want in your garden..
Hell, all i had to start with was 1000 watt mh lamps back in the 80"s.. Then i found hps was so much better... Until the 315 watt cmh/lec, i was sold on hps for my only grow light...Now I've settled on the 315 cmh as my goldielocks light, max light per watt..... It and a scrog screen.. It's main limitation/attraction, is it's small footprint, about the same as a 400 hps... Works for me, i don't grow trees..
Watts/sf is a good guide if you use a 400/600 watt hps.. Yield is about you, and how you grow your plant, not so much your light... You can save a few watts/$$ with led, but you can't grow any better pot than with hps..
Hydro yields the most for me, in the shortest time.. I grow mostly indica, so over 100 days from sprout/clone is a long time for me.. Read the first 14 pages of this thread... 400 watts hps/mh seems to have worked just fine.. After all, it is about who can grow the fattest pig, in the shortest amount of time..

https://www.rollitup.org/t/pineapple-express-g13-labs-seed-to-harvest.344359/

This was my first grow with 2 new SS 315 watt cmh/lec...

https://www.rollitup.org/t/sun-systems-lec-315-reviews.742794/page-11