The Hydro-Coil is a handcrafted vessel made from high temperature borosilicate glass. It is fitted over a High Intensity Discharge (HID) lamp. In operation, water is pumped through the vessel. The water absorbs the radiant heat emitted by the lamp.

The device will remove more than 93% of the radiant heat emitted by the lamp. However it must be remembered that light is a high energy form of heat, and will become heat as it is reflected around the growing area. When the Hydro-Coil is installed, the lamp will therefore still deliver sufficient warmth for the plant - but the heat will be delivered indirectly.

Both glass and water are completely transparent to visible light. The only change to the light spectrum is that the infra-red band (which is not used in photosynthesis) is removed. The physical distribution of the light emitted does change slightly due to refraction, however at no given point is this variation more than 3%. If dirty water is used in the Hydro-Coil, light output would of course be reduced.

Anyone with a tubular (not bulbous) H. I. D. Metal Halide or Sodium Vapor lamp can use the Hydro-Coil. The Hydro-Coil is available in two sizes. The smaller size will fit a 250, 400 or 600 watt lamp. The larger size will fit a 1000 watt lamp. The Hydro-Coil can be used in conjunction with any commercially available reflector except one which has an non-removeable end plate opposite the mogul (the mogul is the ceramic housing around the base of the globe).

Everything is supplied except a reservoir and pump. On reading the manual, you may also wish to purchase and use a few yards of 1/2" black polypropylene (reticulation) hosing. The reservoir should have a volume of least 45 gal. per lamp, although the instruction manual describes a variety of ways to reduce the size of the reservoir required. The pump should have a minimum flow of 50 gal./hour @ 6 ft. of head.

Every six to twelve months the vessel and hosing may have to be cleaned. We recommend that you use rainwater or reverse osmoses filtered water in the reservoir to minimize the need for cleaning. Apart from the pump, the device is silent and has no moving parts. No other maintenance is required, apart from usual maintenance of the pump.

In normal operation, the vessel should last indefinitely, unless it is broken through accident. Unlike other water cooling systems for H. I. D. lighting, with plastic housings, our patented vessel is made of high temp. glass. Plastic housings will have to be replaced every two to four years due to degradation caused by UV light. Glass, however, is not affected by UV light and glass actually becomes stronger when in contact with water. Once again... in normal operation, our glass vessel will not degrade.

We believe that this product offers growers a previously un-obtained level of control over what actually happens in the grow room. The lights can be brought right down over the plants, without burning. Because of this, more yield is obtained from the same light. Because the rate of heat build-up in the grow room is slowed down a great deal, C02 enrichment also becomes much more attractive and cost effective. Other products are available which are advertised as doing a similar job as the Hydro-Coil. Unfortunately, the plastic housings in these products will eventually degrade when in close proximity to a HID lamp. Air cooled devices which enclose the globe will not remove the radiant heat: they will only remove that portion of heat which is trapped by the glass of the globe or the device housing on the way past. This may be as little as 10% of the total heat emitted. Finally, the unique patented design of the Hydro-Coil means a lifetime of trouble free operation, from the most efficient and durable cooling system available for HID lighting.