Hennepdesk said:

Thanks for the replies and positive vibes.

The question by d420dool was:"hey guys im upgradin my setup from 400 to 600 so i was wonderin if any1 had any recomendations thanx."

So my recommendation would be and still is ... stay with 400W and change the setup.
Lets make some calculation. First to know is how to count the result. Do you count in
gr/W? gr/W/day? gr/m2? gr/m2/day?

When you count for cost you should count for sure gr/W/day.
20 days vegging x 18 hours x amount of lights x Watt = .......... W
65 days flowering x 12 hours a day x amount of lights x Watt = .......... W
Add the Watts together and divide it by the days. This is your W/day

Now you have to know your yield in gr. The weight you divide by the
W/day. This will give a 0,0.... gr/W/day.

For example: For a 400W lamp you need 440W to operate. 400W for the
lamp and 40W for the ballast. So count 10% extra to the wattage of the
used bulb to compensate the power consumption by the ballast. I use 10x
400W on 7m2

I don't veg at all so the first calculation:
0 days vegging x 18 hours x 10 lamps x 440W = 0 W
56 days flowering x 12 hours a day x 10 lamps x 440Watt = 2956800 W
2956800 W / 56 days = 52800W/day
The harvest is 4000gr / 52800W/day = 0,0758 gr/W/day in procent (x100)
will give an efficiency of 75,8

Now with vegging and the time a normal strain flowers
20 days vegging x 18 hours x 10 lamps x 440W = 1584000 W
65 days flowering x 12 hours a day x 10 lamps x 440Watt = 3432000 W
1584000 + 342000 = 5016000 W
5016000 W / 85 days = 59012 W/day
The harvest is 4000gr / 59012W/day = 0,0678 gr/W/day in procent (x100)
will give an efficiency of 67,8

The gr/m2 will be the same for both calculations so this is why it doesn't
say much.

4000 W / 7m2 = 571,4 gr/m2 when you add the days then you can compare.

571,4 / 56 days = 10,2 gr/W/m2
571,4 / 85 days = 6,72 gr/W/m2

I didn't count in costs because when you veg you also have to count the extra
nutrients.

So now we can compare every grow to gr/W/m2 and gr/W/day
Do you dare to add your numbers :D

HD

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Hennepdesk said:

Thanks TattooJim,

I smoke all :D

HD

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devilsshare said:

i have seen grows with 600 w bulbs pulling .75 grams per watt per month. That's over 2 pounds per 600w with a nine week OG. (4x3.5 light footprint open wing reflectors) Most growers with thousand watts will never do that with an OG let alone anything else. Obviously a 1000w will produce more light than a 600 w bulb, put also more heat. 600 watts are not only more efficient in terms of lumens per watt, but the reduced heat signature allows for bulbs to be closer to plants, and the reduced distance from plant to bulb can more than make up for the lumen output of 1000w versus 600w. 600s can definitely be better in some situations, as always this is dependent upon the environment more than anything else.

one thing no one has discussed in depth is the difference in efficiency, (wattage as well as btus of heat) of 600s versus 1000watts. If a grow is limited not by space, but by amps, (especially running ACs in sealed rooms) the decision to use 1000 watt versus 600 watt versus 400 watt changes. Ive seen sealed rooms rooms with exposed bulbs handle 20 to 25 1000 watt bulbs with ten tons of AC (20 was alot better in terms of temp than 25). Ive also seen a single five ton handle 25 600s no problem (prob better than the 1000w rooms). these 25 600s at 240v(2.6 amps x 25= 65amps) plus a single 5 ton spiking at 60 amps at 240 demands in total (65 for lights 60 for AC) 125 amps. The same for a 25 light 1000 watt room is 5amps x 25 (lights)+ 2 x 60 amp (ACs)=245 amps total

even if you reduced down the light footprint for the 600s to 3x4 ur looking at a total canopy of 300 square feet versus the 1000ws with 4x4 spacing at 400 ft square total canopy space. the difference of 100 sq ft of canopy does not at all make up for the difference of 120 amps between 125 total for the 600s versus the 245 for the 1000w.

obviously this discussion changes for ducted lights and unsealed rooms but for sealed rooms, and especially if someone is planning a build in a space limited by amperage not space, whats the best way to go?


fuck... i need to go smoke, i hate math

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