The following information is quite technical so it may be best to read this when you’re not stoned so that it can be properly absorbed first time. On the other hand, if you do read it while stoned, you will have a good excuse for not understanding a word of it!
Now that you’ve chosen your growroom, and made some preparations, it’s time to decide on how much light your plants will need and which type of lamp you choose for maximum growth.
There are two main choices of lights; metal halide and high-pressure sodium. Your choice here is crucial as the light is the single most important factor in the success of your crop (that and resisting the temptation to smoke it before it reaches maturity!)
Facts about grow-lights
Both Metal halide (MH) and High-pressure sodium (HPS) lamps are from a group of lamps known as high-density discharge (HID) lamps. The output of the light is much higher than other lamps of their size, making them a powerful and efficient light source for your indoor grow. These HID lamps require a ballast to allow delivery of regular current and proper voltage to the arc. Both lamps also require specialist fittings to allow them to run safely. (Remember, we don’t want a visit from the fire department and, of course, needing an ambulance is also not desirable).
Which do I need?
Realistically, you will need both. Metal halide lights are the choice for the vegetation stage of growth, as they emit light in the white/blue end of the spectrum, promoting bushiness and prohibiting upward growth. For flowering, high-pressure sodium (HPS) is more appropriate as it’s light consists of yellow, orange and red spectrum light, perfect for flower (yum!) and fruit production.
When buying your lamps you need to be aware of the wattage of light you will require. The following is a guide to required wattage. This can be used safely provided you have a good reflector on your lamp as well as good reflective wall covering.
2.5 to 3 feet (0.8 to 0.9m) – 400 watt
3.5 to 4 feet (1 – 1.25m) – 600 watt
4 to 5 feet (1.3 to 1.5 m) – 1000 watt
Smaller lamps are available but aren’t considered a good choice because the low level of light emitted is not sufficient for decent plant growth and, for us, growth is everything!
These lamps are quite an expensive item, so you need to be sure to buy only the highest quality lamps. A faulty lamp would be a disaster for both you and your precious crop. Find out which brands are preferred in your area and check customer testimonials if buying online. A highly recommended brand is Phillips, but there are others which make the grade. My personal choice for lighting supplies is Esoteric Hydroponics
There are others if you can be bothered to search on Google. At the end of the day it’s probably best to go with one that’s quite local to you as this keeps shipping costs down and allows you to get your grow underway as soon as possible.
I hope this all made sense to you. In any case you can come back and read it again…. and again…. and again…. …hmmmm, what was that article about anyway? WOW! Did I just write this?

