does a 400w hps take longer?

[relic1981]

does the same herb grown under a 400w hps take longer to mature than under a 1000w hps? the reason i ask is because i know people growing from exactly the same genetics and theirs always finishes like 10-14 days faster? the only difference is the lighting and nutes. soil is the same.can buds under a 400w be as dense as a 1000w? atleast the tops?

[pflover]

Yes a 1000w has been annecdotally linked to a finishing time about a week or so shorter than a 400w. that said, i would also check the light schedual. if for example the 400 is at 12/12 and the 1000 is at 11:30/12:30 the 1000w would finish even faster. if on the other hand the 1000 was at 12/12 and the 400 was at 11:30/12:30 i would expect the finishing times to be about equal.

[celtic]

a 1000w will produce more vigorous veg and denser buds. so in that sense, you may feel that with your 400 you need to veg longer. are you using the same clones off literally the same mother? are you vegging the same length?

nutes can play a role also. do you tend to go with a lighter feeding regime? do you use a PK13-14/bud booster? do they?

there are many possible factors.

are you both using trichome color to gauge when to harvest?

[pflover]

are you both using trichome color to gauge when to harvest?

good question.

[celtic]

Yes a 1000w has been annecdotally linked to a finishing time about a week or so shorter than a 400w.

this is extremely interesting to me. i have only used 1000ws in the past and am using a 400 currently for the first time as the sole source of light. i have never heard that this is the case before. where did you read this? I would like to read more, this is very interesting

[relic1981]

i guage by trichromes they dont... i use budswell poder and liquid wich is 0-7-0 and for liguid its like.1-1.0-.1 ( that is just off the top off my head, dont have the bottle in front of me. yeah same clones from same moms. veg for about the same lenght of time but theirs gett much bigger in that time

[relic1981]

oh and i always take it very easy on the nutes

[celtic]

ok here is my theory.. you take it light on the nutes which may cause slightly longer development time. also, you go by trichs and they dont- this makes all the difference in the world. what kind of trichs do you wait for, amber? this would make a big difference. do they use a bud booster, too?

i think its a combonation of issues, the main one being you judge by trichs (which is very smart), and the fact that you use lighter nutes may add a few days onto the maturation process.

just my .02

[relic1981]

i wait untill about 50% amber 50% milky... sometimes a little longer, ie. more amber. bud booster will hasten the process?

[celtic]

I dont know if I'd say that, but I will say I feel that skimping on nutes vs feeding stronger nutes, two extremes, you will see the guy feeding them stronger get faster development each time, as long as he doesnt burn them etc.

also, there it is, your answer is in the trichs

[Quixotic]

Yes a 1000w has been anecdotally linked to a finishing time about a week or so shorter than a 400w.

I have found this to be the case from Direct comparisons of cuttings from the same mother, feed the same nutes. I also found that if you want the difference to be reduced some its paramount to get the 400 closer than you would the 1000. 6" makes a huge difference to the light energy reaching the plant. I also noted less yield with the 400 and attribute this to decreased Light penetration into the canopy.

Just my imput from past experience.

Q

[salmayo]

I would say both nutes and light are factors. In fact, any factor that stimulates faster growth, at the same photoperiodic conditions (12/12), should shorten the maturity time of the buds.

One way to think of it is that the plant is growing into the flowering condition. The faster the plant grows into the condition, the faster it will be ready to harvest.

On concept that supports this it the idea of cumulative hormon build up. If the plant will be mature when the ratio of leaf produced hormons to bud produced hormons reaches a certain ratio, then the faster the plant produces the ammount of additional buds to reach this ratio, the faster it will be mature.

CO2 enrichment hastenning harvest is one example that supports these concepts.

[relic1981]

thanks for all the imput everyone. it is much appreciated.
how close does everyone here keep their 400whps? mine is not aircooled. just the light , reflector and a fan!its about 12" forom the top now. should i lower it next cycle?

[celtic]

I am hangin vert with no reflector. also using no fan currently. they are approx 6 inches away at this time. lower is always better, as long as it doesnt burn. what are your canopy temps?