I'm in the process of setting up my first grow. I was originally going to go for 2 x 400w HPS but I am now thinking about switching it to 800W of enviro instead for cost, ease of use and heat issues.

Is the a huge difference in yield between the two? Or anything else I should consider?

Also, I assume 800w of enviro burns the same amount of electricity as 800w of enviro? I think there was maybe some debate about this?

Thanks in advance!

In your situation, its got to be HPS all the way!
Well i'd go with one 400w HPS and one 400w MH.

Enviro's are alright for vegging a mother, or flowering clones in a tight environment, but you'd struggle to yield half as much as you would with HID's

VRG

HPS is it then!

I'll have to start researching fans now I guess...

BTW you wouldn't happen to know if the hype about adjust-a-wing reflectors is genuine, would you?

BTW why 1 MH and 1 HPS? I am really looking for yield here...

Thanks for the reponse

What plantation said.

Also, enviros dont have anywhere near the lifespan of HPS bulbs so your going to be replacing the bulbs more often which is gonna cost you a small fortune in the long run.

Ive not seen the hype, but yes, they are very good.



If your using a two light setup, its preferrable to go MH/HPS. The MH will not only give you stockier veg growth, but it will also improve the phsycoactivity of your bud when used to flower with. All HPS will should give you a slightly better yield.

Plantation is right too.

VRG

And Enviros still give out plenty of heat. They're no more efficient than HID lights so all that electric that doesn't turn into light must end up as heat. Maybe the tubes feel cool enough to touch and it doesn't radiate very far from the bulb like with a HID but it's still there.. unless they defy the laws of physics aswell as all the other impressive claims

All the bud I have seen grown with enviros seems to have a much higher leaf to calyx ratio than the same strain growing under hps or halides

BTW guys, one the subject of adjust-a-wings, does anyone know a good place online I can buy them? Somewhere reliable, tried-and-tested?

BTW which fan would you recommend to vent the 2 x 400w hps? I've been told here before that an 5" RVK should do the trick?

yes i do but i'm not allowed to say..

in answer to your question what everyone else said its about power and penetration,
hps mh all the way

style of grow comes into it as well sea of green etc etc.

600 w give most bang for the buck lumen wise and according to inverse triangle,

enviros would make a good supplementary in your room,

600w hps with dual spectrum enviros...

hps is bulb dependant too ie a good bulb will also improve even mroe on buds than say a shit cheap bulb they do give out diffrent spectrums

a 600w hps will kick out anyhting between 92k lumminens and 97k luminens

the 400w m/h will kick around 38k ? roughly 43k luminens

600 is by far the most effiecent lamp to use

i use mixtures of metal halide 400's and 600's hps gives a good balance if you can control heat

big fans, gale force 8 all the way

uk420 store

even my bulb came in one piece, ppl that know me from here will appreciate the rarity of me recieving whole bulbs im rattling too much kong

[quote=MotaRica,Jul 29 2005, 06:13 PM]
BTW which fan would you recommend to vent the 2 x 400w hps? I've been told here before that an 5" RVK should do the trick?

Nah that not be big enough.You are gonna want at least the 6" but if it was me I'd be going for the 8".You can always regulate the fan in the winter but in summer you are gonna need plenty and I mean plenty of air transfer

Owd

Thanks for the info guys.

I'd like to go for 1 x 600w hps + 1 x 250w hps but my growroom is going to be about 5 foot tall max - I think I'm pushing it doing a scrog with 2 x 400 hps as it is... I think there maybe a serious heat build up with the 600w.

As for the fan - yeah mate, I think I'll take your advice and get something bigger. The room I'm going to set it up in is actually bloody freezing... even on hot days it's pretty cool but it's better safe than sorry.

BTW I was considering adding CO2 as well to improve yield, but I read on another thread that is the flow-through of air is high enough then there is no need for this. Is that correct? Or am I going to pull off an extra few ounces if I add CO2? I'd obviously rather not have to expend the money and effort on adding it, but if a job's worth doing...

Thanks again guys, I'll be sure to post some pics when it's all finally put together.

co2 in natural air rates at 350 ppm parts per million

co2 at cannabis optimum levels of intake are a staggering 1200-1500ppm



edited yield will be well better if you master yer air change and movement with co2 inejector and controls

I've just doubled the space of me GR and added a 600w HPS to the exsitin' 400w HPS. I also swapped me 4" extractor for a 6" one, which seems to be coping just about atm, but i don't think it will when the weather warms up. That said, i haven't enlarged my passive inlets, and the GR in general is more air tight than it was. I'm in two minds about usin' me old 4" as a induction fan or not. On one hand it'll be ideal, on t'other it'll be noisy. :| S'pose i'll figure it Sunday when i come to do it!

Not sure what you mean about 'hype' on adjusta-wings.

I have always found them to be a very good product and very adaptable to your GR enviro requirements. As to ints & exts you cannot go far wrong from S&P or RVK's products. Just a thought and maybe some advice?

EmB.

check out red eye magazine no(19)

they have a comparrison between the two.........

Just to add my 2p here - I veg and flower using blue and red 200w enviro's and they still get pretty damn hot, my 4 inch fan struggles to cope in a wardrobe set up. They cost me nearly 50 quid each and will need replacing after a year so IMO you are probably much better off going with HPS/MH or a combination of the two. Don't get me wrong, I am very happy with the job that the enviros do but they are definately not the cheap and cool option they are often hyped up to be

msmj

I just bought a p2 fluro setup. It cost me £100 but noticed it for £60 at hydro hobby (put the site name since this sites' shop is not running but delete if it is a no-no and soz.) - too late for me but I hear it does a great job of rooting and v.little heat.

Well I was going to use a 200w blue enviro for vegging but maybe a 150w MH would be better, less watts too. Anyone know where I can get one? DO grow shops usually stock wattages that low?

[ sorry to burst your bubble dude but my 2 by 200 watt enviro light comes with one plug with one 13 amp fuse. if you tried to double up 2 200 watt sodiums the fuse would melt every time you tried to turn it on. it draws a hell of alot more current with is greater amount of electrons flowing. the flow of electrons is electricity there for it uses more. I just swapped a 250 sodium for them and in small grows and they solve heaps of problems heat plant burn excessive amount of electricity use. a bit of a smart arse clokey

look at my pic below that plant is growing under 2X125 red enviros and 1X125 blue emviro wat u think im finding them 2 be good at the mo has taken the edge of my temps from a 25o hps just trying 4 summer time see if it works as i have bad temp probs in summer and it has sorted them