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That seems doable with one of those candle covers.
But that kind of glass isn't much of an insulator, so the rate of removed air through the tunnel is enough to cool the bulb down that much?

Also, Would it work if the cool tube cover was slided on from the other end, the tip of the bulb? That would seem easier to construct for me?

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faithless Reviewed by faithless on . ^^^^Making a Grow Light^^^ If anyone has a guide or could make a guide on how to go to lowe's/Home Depot and get the stuff to build myself a 250W HPS Ballast that will work and get me buds, you should PROBABLY post it lol... Rating: 5