Homemade Aircooled Parabolic reflector for vertical bulb!

[Brassman]

Hello Guys!
I just did a test on a 250w HPS hanging verticaly, I am still amazed!!
This is the shit, no more heat stress for me. I will never go back to horisontal reflectors!
Im building myself an aircooled parabolic reflector soon. The termometer is 7,5cm(3") under the bulb and the temp is 27 C(80,6 F).

Did some paper modeling on the aircooled parabolic reflector made for vertical bulb mounting Turned out real good and all the components are present. Im going to build this one in thinn aluminium, MAX 0,5mm thick...probebly thinner to get the right shape. Every thing will be rivet-ed together with heavy duty rivets. The flange is not going to be homemade, just a regular 160mm flange...Obvious this one is a scaled down paper model, well actuly its not even scaled right.

Okay here is the sheet cut out to form the parabolic cone, diameter should be around 800mm, the hole in the middle is 170mm.

Now its a cone and the hole in the middle should be 162mm due to the overlapping of the sheet, it should now accept the 160mm duct flange

Okay here is the flange

Flange and two hooks are installed, this is how its looks.

Here is a view from under and you can see the lamp socket and holder.

So what do you guys think

 

[sm0k4]

It would have to be longer to be able to reflect the whole length of the light no? From the pics it seems like the bulb would protrude passed the wide opening letting light escape to the sides.

Other than that your footprint will be small. Going horizontal with glass cooled hood is not an option?

 

[Brassman]

Yeah it may look that way but this is not true, its quite deep actully. You could possition the bulb in different hights just by modifying the socket bracket. The sorce of light in a 25cm long bulb is only 10cm long...
Glass is not an option for me, just a waste of valuble light im my opinion, besides this light is going to run extremely cool. And as the diametre is 800mm it will not have a small footprint, I recon it would be atleast 100x100cm if its positioned 20cm over the canopy

 

[sm0k4]

Interesting. I shall keep following this. I would like to see it in action.

 

[wisco61]

The reason the temp are so low is the heat from the bulb can escape upwards. By adding this reflector you are trapping the heat that was escaping, thus eliminating the cooling advantage you are seeing.

 

[Sgt.Stedenko]

That's a conical reflector. Not parabolic.

 

[5FingrdSloth]

Gotta agree with Sarge on the design, in my understanding a true parabolic reflector is made up in sections? I'm probbaly wrong though.
Is this just a paper mockup, and will be made from metal at some point? (and not foam reflective board)

 

[Brassman]

Yeah that would be the case if it was a closed top design but as you can see its not. there will be a duct connected to the open top so the hot air rises and get sucked away from the reflector by a 160mm fan..
I admit, its not parabolic..its conical. Reason for this is that it would be 10 times more timeconsuming to build a parabolic design, and it aint going to be 10 times better
Yeah its just a small scale paper mockup, the real deal will be 80cm in diameter and made of 0,5mm aluminium. Reason for this thinn choise of material is that its needs to be flexible and unstable to create a perfect cone, and as it is a very light material it wont break by gravity. Its gonna wieght about 1 kg including the ceramic socket. I will build this on saturday so stay tuned

 

[Brassman]

If I wasent so freaked out about fire hazards I would just take an umbrella and modify it to accept the lampsocket, then apply mylar and a duct flange to it and boom a true parabolic. But I wont do this for HID lights, it would be a fire starter. But if you could get some kind of fireproff reflective film it would rock and be wery easy to build...

 

[Brassman]

Hello I had some time over and this is how they turned out, I made two of them. Im very tired and I post pictures of the build tomorrow...sleep tight

 

[Maj.Cottonmouth]

Looks like it turned out great, let us know how it works for you.

 

[Acotaco]

looks real good man !

 

[yortbogey]

I'd round off those edges.........or wrap them in sumthang........
I'd slit my throat for sure on the edge of that......DAM....thing 1st....day.........be...safe......not sorry.......

 

[libby]

You made that, or was it off, G.C. COM? I dont even see this as a new idea. show me the joints (pun) that was machine spun, not by hand, not having a go, but sounds like BS to me

 

[Brassman]

Thanks all and libby I take your assholism for a compliment
Here some pictures, I put some more info later today. Have a nice day

 

[Brassman]

Thank you all! Very nice compliments guys
Hehe yeah the horror thougt came to me while constructing it so I rounded the edge before I shaped it to a cone just to be safe.
I have to say I build it to fast and with to little thinking, I already got alot of changes in the design and therefor I wont make the how to instructions yet becouse the design is not flowless yet.
I have some improvements to deal with and then Im gonna make a detailed how to for yall, I cant promise this but my new design may include a mechanisem for adjusting the angle of the cone

 

[i grow]

Nice bro thats an awesome job!

 

[Brassman]

Thanks for all the comments guys!
I done some testing and I realise that the reason those reflectors running so fucking cool is that the the reflector isent putting much light down 99% of the light goes to the sides and then reflected down and this makes intenity drop so you get exessive streching witch sucks. I scrapped this vertical design for now, I will do more testing later but for now Im going back to horizontal lights and all the heat have to be dealt with during the summer...mabey I just by a AC unit...

Keep your eyes open for my future thread on the Flood & Drain flower room, will put it up any day now