400w HPS Light Bulb


400w HPS Grow Lamp

These High intensity discharge grow lamps produce a high lumen-per-watt efficiency. Our High Pressure Sodium grow lamps produce a colour spectrum that is somewhat comparable to the sun towards the end of summer. They emit light in the yellow and red parts of the light spectrum and are generally used during the flowering/blooming stage promoting increased resin production and larger yields.


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400w HPS Light Bulb

400w HPS Light Bulb for flowering buds. This is a high 400w hps quality grow lamp from hydro depot South Africa.

A high pressure sodium (HPS) light is a type of grow light that is commonly used for indoor gardening. This grow light stimulates plant growth by diffusing the portion of the electromagnetic spectrum that is ideal for the whole process of photosynthesis. These High Pressure Sodium lights maintain their luminescence fairly well with 90% still available halfway through their lifespan (around 12,000 hours). Hydrodepot HPS bulbs typically emit 80% of their original rated output at the end of life (around 24,000 hours).

  • Designed to increase resin production.
  • Extremely powerful grow lamp.
  • Replace after every 3-4 grows
  • DO NOT TOUCH the light bulb with your bare hands. wear gloves.


We definitely recommend running HPS lighting with very good ventilation. It is extremely important to keep these lights cool to prevent extreme temperatures in your grow area. HPS lighting is extremely powerful, but heat comes that!

We run an air cooled reflector attached to ducting and powerful professional inline fans.

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Additional information

Delivery and Stock

All of our stock for sale on this website is held in South Africa. Delivery Nationwide. Sign up to our newsletter to receive promo codes and more!
We do not sell to any other countries other than South Africa.
Please see our delivery terms for more information.


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