Grams per watt

If I'm using a 600 watt hps light to flower 4 plants , if I'm using the GPW (grams per watt) ,should I get 600 grams off them four plants ? Is that how it is figured ? Or do you add the watts you used in veg the plant ?

charli33 said:

If I'm using a 600 watt hps light to flower 4 plants , if I'm using the GPW (grams per watt) ,should I get 600 grams off them four plants ? Is that how it is figured ? Or do you add the watts you used in veg the plant ?

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nope, just the light you are using in flower. if you can get 1 gram per watt, you're doing very well.

i don't do anything fancy at all, just stick some plants in soil and get .6-.7 grams per watt. this may mean i have a small, small penis, but i am ok with it.

I agree with UncleBuck.

Most people hope for 1gpw but many fail to achieve it.

My last 3 harvests have been
374g
427g
439g
From my 400w hps setup.

For a long time though I couldn't break .5gpw.

Hope for the best but expect the worst.

Work out a figure that's your bottom line amount you'd be happy with.

Personally for me anything over 200g from my setup I class as worth my time doing.

So for a 600w expect 300g and anything over is a bonus.




J

How long you veg for and how long flowering lasts make gram/watt measurements a vague. Here's an example:

If you get 0.8GPW, but you only used 1 week of veg time and flowering only lasted 8 weeks, you did pretty good.
If you get 1.2GPW, but you used 4 weeks of time in veg and it took 12 weeks to flower, you did okay, but not proportionally better like you'd expect.

The 2 numbers 0.8g/W and 1.2g/W don't actually tell you about the efficacy of the grow ops in this case.

A lot of people use g/W*m (grams per watt*month) to rate efficacy, rather than g/W and this is more accurate. W is a unit of power while W*month is a unit of energy.