Hydroponic Supplies Buyer's Guides



Featured Reviews & Guides

  Product Spotlight 

   Grow Tent Review                   

   Ultimate Reflector Test & Guide

Additional Guides

  Climate Control

  Air Cooled Reflector Buyer's Guide

  T5 Reflector Guide

  Nutrient & Additives Buyer's Guide

  Hydroponic Cloning


  Ballast-Reflector Compatibility Chart

  Inline Fan Specifications

  Growing Media


  To view all product videos visit

  Flange Installation

  Grow Tent Videos

Frequently Asked Questions

  Lumatek FAQs

  LED Product FAQs

Special Pages

  LED Resources

  House & Garden Nutrients

  Grow Lights

Reporting Archive

  Field Report: 2011 San Francisco Hydroponics Expo


Quick Growing Reference

Ideal Humidity: 40%-60%
Ideal Temperature: 68-75 °F
CO2: 300-400 PPM minimum
Soil pH: 6.0-6.8
Hydroponics pH: 5.8-6.2
Growth Light Hours: 15-18/day
Bloom Light Hours: 10-12/day

1000W Optimal Light Coverage: 4'x4'
600W Optimal Light Coverage: 4'x4' or 3'x3'
View LED Coverage
Air Cooled Reflector Mounting Height: 18"-24"
MH Bulbs / Blue Spectrum: Plant growth
HPS Bulbs / Red Spectrum: Plant bloom

Basics - Build Your Knowledge Features

Grow Lights

Tip: You do not need to wear gloves or use a cloth when handling grow lights. Clean hands are fine.

Tip: Grow lights require a 12 hour continuous burn in period when first turned on to perform at their maximum potential. For some grow lights, especially the Sun Pulse line, this burn in is required.

High Pressure Sodium vs Metal Halide? Think of the question in relationship to nature. MH bulbs are blue/white when you look at them, HPS bulbs are yellow/orange/red. At the end of winter when the light outside is a cool blue/white coming off a snowy field plants are starting to sprout and grow. During a hot day in summer when the light outside is a yellow/orange/red plants are fruiting/flowering. Use this as a guideline to making your choice.

Seed Starting

What do seeds need to germinate? Most seeds don't require light to germinate, but all require the proper soil temperature. The temperatures listed on seed packages refer to soil temperature, not air temperature.

Humidity domes? Seeds require consistent moisture. The soil needs to be moist but not soggy to prevent the seeds from rooting. A humidity dome is an easy way to retain moisture as your seeds germinate.