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Light opinion 2 400 watts or 1 1000watt...

Discussion in 'General Marijuana Growing' started by FilthyFletch, Mar 29, 2007.


    FilthyFletch Mr I Can Do That For Half

    Ok I want opinions and thoughts on this for future refernce. If you had your choice to go with 4 stationary 400 watt hps lamps over an 8 x 5 table area or 1 1000 watt hps with oversized reflector on a electronic moving rail which would you choose to do? And as a part 2 which would you think would be a lesser current draw in reality the 2 400 watt ballast firing up and running or a single 1000 watt ballast..I know what I think it should be but someone may know more and I want opinions on these 2 questions..Let er rip..:hump:

    videoman40 Well-Known Member

    Okay, let's start another argument................

    In my opinion two 400 watt lights will outperform one 1000 watt light. It'll be cheaper to run, get closer and putout more lumens at the plant.

    A safe distance for a 400 watt light is about 10 inches, while the 1000 watt light will have to be about 14" away. Does that 4 inches mean anything....ask yr wife or g/f what she thinks. j/k

    What this does mean is that the larger light at 14" puts out about 33,000 lumens, while the 400 watt light is putting out 38,000 lumens.......per light!

    bigbudeddie Well-Known Member

    yep basically what he said^^^ definately 2 x 400w would be better and cheaper.

    FilthyFletch Mr I Can Do That For Half

    Hmmm now can 2 lights be put on a 6 foot rail sytem and be made to move to get better coverage then? I have 1 rail with 1 motor can I rig a single mout arm hang it from the rail and put stops to left and right to mve the 2 lights together??

    joekikass Well-Known Member

    that a bit of a tough one if you have motorize rail system to keep to 1000 w moving around i mite go with the 1000 watt light . i have been using 2 400 w in a 7'x5' with good results but have upgraded to a 6 nd a 400 w hoping to get better light penetration on the lower bud sites and i think you might get better penetration with the 1000 w .

    VictorVIcious Well-Known Member

    In my opinion neither of these is ideal. 8' by 5' is too wide for the 400 watt lights, and too long for the 1000 watt. What happened too 600 watt?

    green_nobody Well-Known Member

    i go with you video on this, with 2 400W you get less heat as with a 1000W one, about the same lumen or even more since a un-cooled 1000W has to stay more the 2 ft of the plant really while a 400W un-cooled can get as close as a ft to the plant:)

    FilthyFletch Mr I Can Do That For Half

    600 watt lights are a rare thing and exspensive as I looked for those thought about 2 of those.I was thinking if I used the 2 400 wat lights with a moving rail I might be able to weld up some kind of double hanger bar as long as i can figure the balance out then hook this to my motorizes mover which would fix my concern about middle plants getting little cheated on light. I could have the lights go 2 feet to the right and then back across the middle 2 feet to the left of center gettinga ll plants even light use.If this is too difficult I will just have to grab another 400 watt light for the middle which I dont wanna do but Im sitting here with 2 400 watt hps lights 1 400 watt mh 2 1000watt mh and 2 1000 watt hps but just dont wanna reall go 2 1000 watt lights just in case it brings any attention. I bought 24 100 watt cfls the ones that use like 30 watts for $22 shipp yesterday so I can lower the rest of the houses wattage usage by half but guess we will have to see.In the aero grow tops are my main concern as I know pemtration will be minimal with 2 400 watt lights so the colas will be my main goals with plants rather short at like 3-4 feet.So many options maybe I need 2 grows for a comparioson hmmmm 2grows twice the buds mmmm
    Garden Knowm

    Garden Knowm The Love Doctor

    Hello mr. filthy

    The 400s WILL ONLY out preform the 1000 IF..

    you flower your plants very very small.. 4-5 nodes and you grow shit loads of plants.. it will have to be a serious sea of green...

    the lights will have to be ventilated VERY VERY well and kept close to the plants.. less than 12inches..

    turn over will be KEY.. lots of plants.. short life cycle.. lots of work...

    .... if you put the same amount of work into DIALING a perfct 1000 watt grow set up.. the 1000 would probably be a lot less work.... a lot fewer plants.... and over all better quality buds... there is no comparison to the 1000 watt hps's ability to grow finer herb.

    2 - 400s would be fun... but I would go with the 1000...

    unless... i was going to have 2 grow areas... then I might re-consider having 2 hps bulbs... bu probably still go wit hthe 1000 and use cfls for short veg time... in seperate area...

    Garden Knowm

    Garden Knowm The Love Doctor


    Videoman, thanks for the PM... YOU ARE A FREAKING COOL CAT!!

    ummm.. The 400 may have more lumens like you said.... I just have not seen the massive yields from 400's that I have seen from 1000's..

    IN the 3rd DVD SeeMoreBUds has coming out soon.. there is a garden that produces 5-6 lbs with only 2 - 1000 watt bulbs.. I have never seen a pair 400's even come close..

    This is probably because the 1000 has so much more penetration thus, NOT only producing THICKER but also longer buds...

    That being said.. all the numbers may support your answer and I would love to be wrong... I have just not seen the evidence..

    I apolgize for coming across as a know it all.. cause I don't know it all ... LOL.... and I appreciate your solid and educated re4sponse..


    smkpt Well-Known Member

    id go with the 2 400 watts

    FilthyFletch Mr I Can Do That For Half

    Well the idea here is to have ideally 3 foot or final plants.Im aiming reasonable for the setup I have but now it can achieve much more.Its 28 plants which the actual system surface is about 4 feeet by 7 feet long.The actual room is 8 x 8 x 10.I am going to co2 inject these probably trim some of the lower branches and still in debate wheteher to crop these. Im gonna gun for a minimal out put of 1 oz per plant but know with practice and tweaking 3-4 oz per is gonna be possible in roughly 6-7 weeks flower.They will also get a shot of sweet leaf and carbo load to fatten the buds.My ideal goal is to get 4 lbs out of the setup every 7 weeks having a flowering area setup so I can have the second batch ready as the first is ending.I think I will do the 2 400 watt lights first maybe add a 3rd in there.Maybe even throw 3 8 foot shop lights next to each chamber runn shooting up from the bottom to just add a little kick and see what this gets me and if it gives good enough next round I'll kick it up to 2 1000 watt lights and see what we can do but 2 1000 watters is all I wanna kick on for the 12 /12 cycle.Cost wont be to bad at 12/12 should add maybe 150 each month of use if even that so about 300 bucks to use them but gotta keep total usage down to keep husssh where its at.

    abudsmoker Well-Known Member

    a 400 watt is 3x3 a 1k is 5x5 you are correct neither set up will be enough

    and 2 400 is not superior to a 1k light.

    abudsmoker Well-Known Member

    based on the space you quoted to plants will be serious crowded at 3 foot cutting yeild about half.

    in a 5x5 i cram 12 plants tops @ 3.5 feet if you look at my gallery you will see 2 1k lights in 24 inch cyliders. my area is 5x10 the lower 2 foot of plant becomes useless. when i cut my # of plants the yeild tripled.
    now we talk about heat. and your gonna be using depending on your veg room 3800 to 4600 watts per hour so lets do the math.
    4.0 KwH x 12 hours 48 kwh per day (plus what ever the veg side does for 6 more hours) 48x 30 days= 1440 kwh.

    and 4 lbs from this setup even with 1k veg and 2k flower will be tough. with crowding your assumption of 1 oz- 3 oz will be hard.

    abudsmoker Well-Known Member

    this is also a unproven 2 reflectors producing 400w will make a butload of heat. one 1 k light will produce alot also. it would be much cheaper and easier to remove or lower the heat signature of 1 lamp than 2. both lights need about 11 inch space from plants. in my cylinders running 1k lights they are 91F 7 inches away. my 400 in the same cylinder produced 90F 7 inches away. at 11 inches the temp lowers to 83 F for the1k and the 400 80F this heat reduction is how much IR heat. when i use a liquid cooled cylinder the 3inch temp is 84 f.

    the liquid cooled cylinder filters the IR heat.

    a 400 watter makes less IR however makes far less usable lumens.

    the premise that lower heat makes you closer to the bulb is true. butwhen you manage the heat from 1k lights your formula is false..

    this is as bad as saying foxfarms organic foods needs no flushing. call foxfarms they will tell you the same thing.

    call tony a htgsupply.com 1888710 grow or texas hydro 1512459grow. or anyother hobby shop. flushing soil is important.

    enough said................ test your posts before you have to eat crow or put your foot in your mouth.

    videoman40 Well-Known Member

    Dude, I keep my 430 at 8" with no heat problem at all, proper cooling is necessary regardless of wattage being used. I only use two small computer fans to exhaust hot air from my light.
    Obviously flushing works well for you. I am sure that there is more than one way to grow a weed. as I stated, I decided not to flush, my wife and I both love the taste of our weed. There's more than a few people who feel the same about flushing.

    FilthyFletch Mr I Can Do That For Half

    Well seems like many opinions on here but a few have not read everything I think. Those saying 1000 over a 7 foot table type area wouldnt work must have passed over the fact that would used with a motorized light mover which means length of 7 feet is irrelavant.Heat from either setup isnt a problem for me.My 2 400 watt lights dont really have muchy affect room temp stays under 80 all day. The single 1000 watt light is about the same as far as heat goes.Also take into fact the reflectors I have are almost 3feet by 3 feet so 2 reflectors almost blanket the area.I have made the decision this round to go with a 3 400 watt light set up.I can keep these within 8 inches of the tops easy with no heat issues. My budddy who did an ebb and flow 4 x 8 table with 20 plants using 3 lights just harvested at 3.5 feet getting 3-5 oz per plant so I think I'm safe in my assumtion of 3-4 oz per plant is achieveable as my plants are at a rate of twice his growth and were from same original mom as my moms.These indicas yeild hard and heavy like I have posted before I have seen this particular yield 10-14 oz per plant inside.My spaceing is actually a little better then his was so my plants have more room and he didnt use any co2 injection even though he has a generator as he is too lazy to set it up lol.We will see what we get.I have also decided to crop each plant and go for the double colas and keep lower branches thin.So we will see.Next grow going 2 1000 watt hps screw it lol

    skunkushybrid New Member

    With the right light hoods and right spacing between lights, 2 400's could work as well as a 1000. Ask Cervantes.

    FilthyFletch Mr I Can Do That For Half

    I think that 2 could be as usuefull as the 1 1000 watt in this setup but just to even it up Im adding a 3rd 400 watter then next round will do the 2 1000 wat light then have the answers I need.I appreciate all the input from everyone thought good stuff to look over

    joekikass Well-Known Member

    3 400s sounds better

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