diy cool tube

Discussion in 'Do It Yourself' started by sour420D, Dec 1, 2009.

  1.  
    sour420D

    sour420D Member


    i found this on the web so not my idea but will make one thought it was worth sharing if u like please add some rep thanks

    Clean and Easy Cool Tube


    This is a detailed tutorial on how to put together your very own cool tube. You can assemble one of these in about 20 minutes. This is based on a 150 watt HPS, but may be adapted as needed.

    What You Need:

    [​IMG]

    1 x Pyrex Bake-A-Round tube (long discontinued, but available readily on EBay and in classifieds, Flea markets etc – surprisingly common) - $10-15
    1 x pair of Café Rod brackets (hardware store, where window fittings are located) - $1.50
    1 x Ceramic medium or mogul lamp base with standard mounting hole - $0.99
    1 x 1”-1.5” (approx) hose clamp - $0.80
    1 x 3.5”-4” (approx) hose clamp - $1.00
    2 x 4.5”-5” (approx) hose clamps - $2.50
    1 x roll of self adhesive insulting foam for hot water pipes. - $2.50
    1 x #6 – 32 x 3/8” (machine screws with nuts) - $0.99
    1 x multipurpose (including glass) glue or epoxy (optional) - $3.00
    1 x 400°F small tube of silicone sealant - $2.50
    Your HPS/4” duct system – N/A


    Step 1:

    Collect your café rod brackets, lamp base, and screws.

    [​IMG]


    Remove one of the café rods and bend into roughly the shape illustrated in the next photo (you may need a something to help such as a pair of pliers).

    [​IMG]


    Attach the café rod to the lamp socket’s mounting hole using a screw and nut.

    [​IMG]

    [​IMG]


    Connect the wires from your power source line to the lamp socket. The white wire should connect to the silver screw, and the black wire to the brass / darker screw (this is standard color coding). I used a little bit of solder for good measure. Leave the ground wire (green) unconnected for now, ideally left a little longer than the others.
    Cut and bend the remaining café rod into three pieces with tabs on the end as shown. The longest/middle section should measure 1&1/8” on each (medium) or 7/8" (mogul). The other sections are of negligible length, but around ½” is good. These are your spacers.

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    Fasten the spacers to the lamp socket as shown. Use your epoxy or glue if desired in addition to the clamp to make sure everything is firmly in place.

    [​IMG]

    Step 2:

    Hang your bulb assembly over the end of the Bake-a-Round. You will notice that there is a slight bit of play between the spacers attached to the socket, and the inner walls of the tube (if you measured correctly and don’t have an oddly sized socket). This is deliberate and is to account for possible thermal expansion in the metal. Fitting the spacers firmly could result in a cracked or broken tube!

    [​IMG]


    Place the bulb in the socket and clamp the hook hanging over the side of the glass tube with the ~4” Clamp. Tack the hook and clamp with epoxy/glue for added strength (The glued clamp can still be popped off, so don’t worry too much about how you will change the bulb).

    [​IMG]


    Step 3:

    Wrap self adhesive insulating foam around each end on the tube as shown (or only one if you are using exhaust only). This will allow 4” duct to fit very snugly to the tube (which it’s self is 3 ¾” O.D.), and will also act as a gasket/seal when clamped.

    [​IMG]


    Thread wiring through the ducting, attach the ducting to the tube, and clamp in place. Finish with silicone sealant if desired. Connect the ground to the duct or the café rod hook.

    [​IMG]


    Add an optional reflector made from unclosed rigid duct (you can find this in your hardware store – it’s a piece of sheet metal with a snap together seam that hasn’t been connected). Simply cut to length, cut flanges a half inch from the ends, and clamp those to the duct/tube. Hang your lamp with light chain available from your hardware store by the foot. The chain attaches under the clamps on the duct. You’re done!

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    wasd, XS Brain and sono like this.
  2.  
    keebee

    keebee Member

    This info was very helpful to me!!:) I will have to modify it's design a little for my 250w hps, but I'm on my way to Home Depot in the morning!
    sono likes this.
  3.  
    JediMind

    JediMind Member

    If i dont have a home depot in my area,.
    were can i then find the glas tube, that is needed.. If possible for 400w hps.
    Any one know any online shop perhaps ?
  4.  
    denotsmi

    denotsmi Member

    I read in another post that the Pyrex tube is too small for the 400 watt bulb.
  5.  
    purplekitty7772008

    purplekitty7772008 Well-Known Member

    very nice

    had to comment so i don't lose the thread
  6.  
    alexonfire

    alexonfire Well-Known Member

    wow, really nice. Im going to use that to make on myself
  7.  
    sour420D

    sour420D Member

    it's is for making bread look on e bay their like $25 dollars tops but the use this type of glass in planes and the space shuttle not sure about the 400hps but i just have a 150hps it works fine
  8.  
    JediMind

    JediMind Member

    Sweet.. but it sucks the 400 is to big..
    But any way, its a nice idea.. :)
  9.  
    avid.toke

    avid.toke Active Member

    I was wondering what sort of fans you would use to cause airflow through the tube? I have a 3'x3'x4' grow box and i would like to install something similar but the only thing i could really find as far as ventilation fans go were these
    Inductor 6 In. In-Line Duct Booster Fans.

    If you're savvy with this sort of stuff i was wondering if you would be able to explain how I would go about getting power to these sorts of fans. I feel like they don't just plug into a wall socket
  10.  
    bca21

    bca21 Well-Known Member

    it will fit a 400 and 600 watt hps, not m/h. There 5 inches in diameter
  11.  
    louisianimal

    louisianimal Member

    what the max light size that can be used in this design without requiring a ballast?
  12.  
    purplehazin

    purplehazin Well-Known Member

    If you mean the bake-a-round tube, no. The tube is 3-3/4" Dia. But you're correct that HPS bulbs (being long and skinny) will fit while the fat MH's will not.
  13.  
    purplehazin

    purplehazin Well-Known Member


    Not sure what you're asking, but the bake-a-round tube is 3-3/4" Dia there's just enough room for a bulb, nothing else.
  14.  
    Jimb0420

    Jimb0420 Member

    This is great!

    I heard you can use Hurricane glass which is sold at most craft and hobby stores. As for the 150w, I was originally going to do the "security light" conversion from a 150w light which I know are sold at Lowes. Home Depot has 70w and 100w, but these use a ballast. I am no electrician by any means but why do the ones I was planning on building need a ballast but this one doesn't?
  15.  
    louisianimal

    louisianimal Member


    it looked like he just wired the light socket to a regular power cord, i was under the impression that a HID light required a ballast, do lower wattage HID bulbs not require a ballast?
  16.  
    purplehazin

    purplehazin Well-Known Member

    that cord plugs into his ballast; you can kind of see it in the background... (silver box at top of last picture)
  17.  
    louisianimal

    louisianimal Member

    ight thanks man, kinda seems like a dumb question now lol
  18.  
    Jimb0420

    Jimb0420 Member

    Thnx, I actually realized this when I slept on it.
  19.  
    Jimb0420

    Jimb0420 Member

    I asked too, so don't feel so bad. Like I stated, "I am no electrician"
  20.  
    hydrophiloides

    hydrophiloides Member

    Very cool design good post my dude!

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