How to properly connect HPS?

How to properly connect HPS

Lighting, along with nourishing the plants and ventilating the growth box, is the cornerstone of successful growth. With a lack of light, the plant with the best genetics, fed with top fertilizers, is unlikely to please with a bountiful harvest. Therefore, the issues of choosing the type of lamp, selecting the power for the size of the box/awning, assembling, and installing the lamp in the growth box are always relevant for a novice gardener. Buy the best 3×3 grow tent.

HPS – High-Pressure Sodium Sodium Arc Lamp (HPS) has been used in plant growth since the middle of the last century. For more than fifty years, this technology has been brought to perfection and, despite serious competition from LED lamps, DNaT remains the “gold standard” of phytolith. HPS-based solutions combine energy efficiency, durability, reliability, and relatively low cost.

Sodium lamps give a pleasant orange light, and phyto-HNaT is often added to the spectrum in blue.

HPS lamp device

Advantages and disadvantages of HPS


  • Energy efficiency (efficiency 30%)
  • High light output (up to 150 lm / W)
  • Service life over 10,000 hours
  • Simplicity and reliability of the design


  • Long start and hot set on fire
  • The drop in brightness towards the end of the service life
  • May not turn on after a short power outage
  • The high operating temperature of the burner, at a power of 400 W or more, the use of Cooltube is recommended  

In which growing box or awning to install the DNaT

It makes sense to install HPS from 250 W and more in a spacious grow room with powerful exhaust ventilation. The power is selected according to the area of ​​the box according to the table:

  • DNAT 150 – 50×50 cm (0.25 sq.m.)
  • DNAT 250 – 60×60 cm (0.36 sq.m)
  • DNAT 400 – 90×90 cm (0.8 sq.m.)
  • DNAT 600 – 110х110 cm (1.2 sq.m.)
  • DNAT 1000 – 130×130 cm (1.7 sq.m.)

In a box, less than 0.3 square meters, the use of a lamp of this type is not always justified. If there are problems with exhaust ventilation or in your area there is a power outage and the light disappears for short periods of time, it is definitely not recommended to use HPS. In this case, it is worth using a colder and not sensitive to voltage drops  LED lamp.

Control gear for sodium lamps

HPS with a power of 70-150 W have the same E27 base as an incandescent lamp or ESL (CFL), it is enough to simply screw it into the power grid – like an ordinary light bulb. But it is absolutely NOT possible to do this, at best it simply will not turn on, at worst it will explode.

To connect HPS, like all gas-discharge lamps, you need a ballast (ballast) or so-called “ballast”. On the one hand, the control gear ignites it with a high-voltage pulse, on the other hand, the control gear limits the current in the circuit, thereby maintaining the stable operation of the lamp.

There are two classes of ballasts for HPS:

  • electromagnetic ballast ( EMPRA ) – a circuit consisting of a current-limiting choke, a pulse triggering device and a phase-compensating capacitor;
  • electronic ballast ( ECG ) – a single compact and lightweight unit based on a more modern element base. Combines all the functions of an electronic ballast plus a built-in surge protector, short circuit protection, lamp dimmer.