Indoor Cannabis Growing: A Beginner’s Guide to Lighting and Setup

Growing cannabis indoors under artificial light—known as indoor growing—is a popular way to produce your own supply. But cannabis plants won’t thrive without replicating their natural environmental needs. Success hinges on three critical factors: light, climate control, and proper nutrition.

Lighting: The Foundation of Growth

Cannabis demands intense light for photosynthesis. Not just any bulb will do. The growth cycle requires different light spectra and intensities at each stage:

• Seedlings & Clones (First Weeks): Use fluorescent tubes (LSR) with high blue-white spectrum. They run cool, allowing close placement for maximum light absorption. Run 18 hours on / 6 hours off via timer.
• Vegetative Stage (~20 cm tall): Switch to metal halide (MHL) lamps for strong blue light and high lumen output, maintaining 18/6 light cycle until desired height.
• Flowering Stage: Transition to high-pressure sodium (NDL) lamps with high red spectrum for bud development. Shift to 12/12 light cycle. Plants may stretch 40–110 cm more during early flowering.

Flowering lasts 5–12 weeks depending on strain. With the right light strategy, you can achieve a successful harvest.

Keep it green.