High Pressure Sodium HPS Grow Light Bulbs

High Pressure Sodium - HPS HPS Plant Grow Light

High pressure sodium bulbs emit an orange-red glow. This band of light triggers hormones in plants to increase flowering/budding in plants. They are the best grow lights available for secondary or supplemental lighting (used in conjunction with natural sunlight). This is ideal for greenhouse growing applications.

Not only is this a great flowering light, it has two features that make it a more economical choice. The average lifespan is twice that of metal halides, but after 18,000 hours of use, they will start to draw more electricity than their rated watts while gradually producing less light. HPS bulbs are very efficient. They produce up to 140 lumens per watt. The disadvantage is they are deficient in the blue spectrum. If a gardener were to start a young plant under a HPS bulb, she/he would see impressive vertical growth. In fact, probably too impressive. Most plants would grow up thin and lanky and in no time you will have to prune your plant back before it grows into the light fixture. The exception to this is using HPS grow lights in a greenhouse or in conjunction another light source that emits light in the blue spectrum. Light sources that have a high output in the blue spectrum like sunlight and MH grow lights offset any stretching caused by HPS bulbs. View 100 to 400 watt HID grow lights, View 400 to 1000 watt HID grow lights.

HID Light Output

Primary Growing Area
Supplemental Growing Area

100 watts

• 2' x 2'
• 3' x 3'

250 watts

• 3' x 3'
• 5' x 5'

400 watts

• 5' x 5'
• 8' x 8'

600 watts

• 6' x 6'
• 10' x 10'

1000 watts

• 8' x 8'
• 12' x 12'

Hanging height:
Due to the heat that is emitted from these types of fixtures, you should hang them according to size. Smaller wattage systems (100 and 250) should be hung about 2 to 3 feet from the top of the plants. Medium wattage systems (400 and 600) should be hung around 4 feet from the top of the plants. High wattage systems (1000 and up) should be placed at least 4 to 6 feet from the plant tops.

How long should lights run?
This depends on the type of plant. Most plants and vegetables need about 10 to 12 hours of light to promote growth. Plants that produce fruits or flowers will show improvement with up to 16 hours a day of supplemental light.

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Purchase Returns and Exchanges Important Return Policy News: Beginning March 2008, we initiated a change to our return policy. ExpressLightBulbs.com will accept merchandise returns for Standard Delivery items within 30 days of purchase and issue a credit or refund at the time of return only with a valid packing slip. We appreciate your understanding that ExpressLightBulbs.com merchandise may only be returned by mail or ground service (UPS or Fed Ex). Upon return, your merchandise will be inspected. Credits or refunds issued will be for the item value. Any taxes charged will be refunded in accordance with state laws. Shipping and handling charges are nonrefundable. To return an item by mail, follow the instructions on the packing slip enclosed in your order, insure the package, and mail it to the ExpressLightBulbs.com address on your packing slip. If you do not have a packing slip, please call us at 888.553.5655 and we will gladly assist you.