R.C.C Offical CFL FAQ

Discussion in 'CFL / Fluorescent Lighting' started by FarmingToronto, Sep 11, 2008.


    FarmingToronto Well-Known Member

    Hey everyone I know the good Dr. Chronic has gone ahead and typed up a really informative document for you guys to all read. This is just a basic follow up with direct questions and answers. Again most of this is covered in his document.

    Q. Can I grow start to finish with CFL lighting?
    A. Absolutely, one can grow nice personal stash from start to finish with just simple CFL bulbs.

    Q. Will CFL’s make my plants “Super Stretchy”
    A. Stretch is more a function of WHERE the light source is as opposed to the type of light source. What I mean by that is if your bulbs are too far from the plant, then yes there can be a significant amount of stretch. So the key to using CFL’s is to get your bulbs as close as you can without burning or hurting your plant. The approximate distance would be 1 – 2 inches.

    *Tip* Put your hand between the bulb and top of your plant. If its too hot for you hand, its too hot for your plant.

    Q. Will CFL’s give me “fluffy buds” and “popcorn buds”
    A. Again, it depends on the amount of light and distance.

    Q. I see 2 different wattage on my CFL package, which is the right one ?
    A. Well technically they are both good info, however the more important one to us is the first number. The first number is the true wattage of the CFL bulb, where as the second is the incandescent equivalent value.

    Q. Which bulbs do I buy ??
    A. Ok so this is a pretty loaded question for a FAQ. I will start off by saying; check out Dr.Chronics document, as it very much explains this in detail.

    Q. Which bulbs are for Vegetative Growth?
    A. 6500K (Daylight)
    Q. Which bulbs are for Flowering Growth?
    A. 2700K (Soft white)

    Q. Can I mix spectrum's during both or either phase?
    A. Really depends on who you ask..Some will say use both through-out as its a more natural range. Where as some would say (myself included) its ok to use a mix however make sure there are at least 2 – 1 of the “proper” colour for the phase of growth. Others just stick with ONLY the #’s I listed above.

    Q. What does the K stand for? And how do I know what K my bulbs are?
    A. The K stands for Kelvin, which is a unit of measurement. To find the K can be easy sometimes and frustrating other times. First place to check is ALL OVER THE BOX/PACKAGE. Next up check the actual bulb itself, often times they’ll print the info directly on the bulbs. Finally and only confirmed at Home Depot is if you look at the stickers on the shelf they will generally say 26W 6500K 1 PK or whatever, you get the idea.

    Q. Is total darkness required?
    A. For veg, no not really.. Some people run 24 hr light cycles, however if you plan to have some dark time. Then I’d highly suggest making your box/area as light proof as possible both in and out. Now during flowering its ABSOLUTLY required that you keep your box PITCH BLACK during the dark time. I’m talking so black I can’t even see my own hand in my area during dark time.

    Q. Is this information a direct step-by-step how to of growing with CFL’S?
    A. No, this FAQ isn’t supposed to be more about using CFL’s than growing marijuana. If you want a help with Growing problems, RollItUp has an AWESOME GROWFAQ located right on sight. Please refer to that if you have any questions regarding general growing.

    Q. Can I use CFL's in a large room?
    A. Yes, but not that practical. CFL's ideally do extremely well in a small enclosed space with well reflective surfaces.

    Q. Should I use one large CFL, or a few smaller ones?
    A. Depends on your situations. Larger CFL's have higher lumens focused on a smaller "light foot print". An array of smaller CFL’s will have less lumens, but equally spread out in a larger "light foot print"

    Q. How long to CFL's last?
    A. Depends on make and model, however, you should replace your CFL's after each grow, or every 3 months, since they lose luminosity over time. (Note. Replace your house bulbs, with your used CFL's)

    Q. I have a 400w MH/HPS closet grow, can CFL's still help me?
    A. Yes.. you can use CFL’s as supplement lighting on the sides and even under your plants, with out extra ballasts or a spice in your power bill.

    Thanks, goes out to Dr.Chronic for his amazing reference Document. I’d also like to thank Wolfman_Zen very much as well for his awesome contributions to this FAQ and finally I’d like to send a shout-out to BigD921 and other who’ve helped me without you guys I’d not have half as much CFL knowledge as I had when I started. Thanks guys.
    To the readers, I hope this helps you guys out in conjunction with Dr.Chornics info and feel free to PM or msg me in my threads anytime.

    Take Care,

    tyeee Well-Known Member

    The best CFL faq i've ever seen....Good one man!!! :weed:

    Dr.Chronic Well-Known Member

    Awsome Toronto, you are the man! +rep.
    I'mBatman likes this.

    taytheday Active Member

    keepin em clued! nice faq :)
    yithdream likes this.

    FarmingToronto Well-Known Member

    Thank you very much for the compliments guys, i hope this lil doc can help some ppl out


    drevil1981 Active Member

    Everyone assures ne I need a 150W HPS.

    My buddy and I built a nice grow box that has inside dimensions of 3'1 high, 1'6 deep and 2'4 wide. It contains 1" reflective insulation and weather tight with a door a fan that brings in fresh air and an exhaust that takes air out into a HVAC duct with fabric softner to help dull the smell. I will be using the Aerogarden Deluxe.

    So to go along with the 3 Aerolights, if I wre not to go with HPS how many CFL's would I need on each side. I think I might plan to mix 2-1 on Veg and flowering keeping the higher ratio to what it needs (2700-6500)

    Or should I do 2 each side with the HPS overhead(there so big and hot compared to CFL's)

    Is it better to have a group 3-4 each side of low wattage CFL's(20-30W) or 1/2 high ones(100-200W) each side

    PS Im only growing 3 in the Aero

    Padishah Well-Known Member

    here is some helpful cfl info since some manufactures dont use a "k" rating

    daylight white = 6500k
    bright white = 5000k
    cool white = 4100k
    neutral white = 3500k
    soft white = 2800k
    warm white = 2700k
    cerealgraham likes this.

    Kdubble101 Active Member

    This forum is great, lots of love here:weed:

    drevil1981 Active Member

    HOw many lumnes/watts w

    What about those 24" Sunblaster T5's, how good are those guys and do those need to be 1" away from the plant as well. or set back to 4-6"

    Dr.Chronic Well-Known Member

    :leaf::leaf:Toronto those are excellent questions, very good job. :leaf::leaf:I think we are doing a great educating out fellow CFL growers pretty well.:leaf::leaf:

    wackymack Well-Known Member

    id like to join the reindeer games and get a tag too.

    if u cant grow with cfls and only with hids than hang it up,u need to be smart with cfls,u can get exceptional yeilds with cfls

    mistaphuck Well-Known Member

    wow its really stonerproof!

    mistaphuck Well-Known Member

    wooooo 100

    Dr.Chronic Well-Known Member

    Let me fix that for you...
    Daylight = 6500K
    Full Spectrum = 5000K
    Cool White = 4000K
    Bright White = 3500K
    Soft White = 3000K
    Warm White = 2700K

    There are exceptions to this... Ge label's their 2700K bulbs soft white, while 90% of other manuf. will label a 2700K bulb Warm White. It make's no sense but that's how its done.

    700m45 Active Member

    i'm planning to buy one 150w Envirolite and one 125 Envirolite both with red spectrum. Red is for blooming right? But can i use them for veg stage too ?

    Dr.Chronic Well-Known Member

    :leaf::leaf: Yeah it is for flowering. You can use it to veg but i wouldn't recommend it. :leaf::leaf:

    700m45 Active Member

    why not ?
    ok, but what about one 200w red spec and one 200w blue spec Envirolite for using in both stages?

    Dr.Chronic Well-Known Member


    hopbr4 Well-Known Member

    this is good stuff man thanks! lots of help

    grindafish Active Member

    This is a great sticky, thanks. I am doing my first ever grow right now and I have learned everything from this forum! Thanks everyone for sharing all your knowledge here!

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