HPS vs LED: Which lighting for which grower?

HPS vs LED - the most important decision for every indoor grower:

**HPS lighting (High Pressure Sodium)**

*Advantages of HPS:*

- Low initial cost (150-300€ setup)

- Proven technology for 30+ years

- Excellent light penetration in dense canopies

- Additional warmth useful in cold rooms

- Large selection of light sources and reflectors

- Easy to repair/replace

*Disadvantages of HPS:*

- High power consumption (40-50% less efficient than LED)

- Strong heat development requires additional cooling

- Regular bulb replacement (every 12-18 months)

- Fixed light spectrum, not customisable

- Shorter service life of the light sources

- Fire hazard with improper installation

**LED lighting (Light Emitting Diodes)**

*Advantages of LED:*

- 40-50% lower power consumption

- Minimal heat generation

- 5-10 years service life without changing bulbs

- Customisable spectrum (dimmer, different channels)

- Compact design, easy installation

- Environmentally friendly (no mercury)

*Disadvantages of LED:*

- High acquisition costs (500-1500€ for quality)

- More complex technology

- Less heat generation can be a problem in cold rooms

- Extreme differences in quality between manufacturers

- Repair often not possible (complete replacement)

**Cost comparison over 5 years:**

*HPS setup (600W):*

- Purchase: €250 (ballast, reflector, light source)

- Electricity: 5 years × 365 days × 12h × 0.7kW × 0.30€ = 4,599€

- Light source: 4 × 60€ = 240€

- Total: 5,089€

*LED setup (400W for the same amount of light):*

- Purchase: 800€ (quality LED with Samsung chips)

- Electricity: 5 years × 365 days × 12h × 0.4kW × 0.30€ = 2,628€

- Replacement: 0€

- Total: 3,428€

- **Savings: 1,661€**

**Yield comparison:**

*HPS yields:*

- Proven: 0.5-1.0g per watt

- 600W HPS = 300-600g typical

- Depending on variety and ability

*LED yields:*

- Modern: 0.8-1.5g per watt

- 400W LED = 320-600g typical

- Often higher quality (terpenes, trichomes)

**When to choose HPS:**

*Ideal HPS applications:*

- Limited initial budget (<500€)

- Cold grow rooms (additional heat desired)

- Large commercial installations (low unit cost)

- Proven setups that work

- Experienced growers with HPS know-how

*HPS-optimised strains:*

- Classic sativas (Haze families)

- Landraces from equatorial regions

- Varieties with dense canopy

**When to choose LED:**

*Ideal LED applications:*

- Long-term investment (5+ years)

- Heat problems in the grow room

- High electricity costs (>0.25€/kWh)

- Discreet setups (less heat emission)

- Technically interested growers

- Several grow cycles per year

*LED-optimised varieties:*

- Modern hybrids

- Autoflower varieties

- Compact indica-dominant strains

**Hybrid solutions:**

*HPS + LED combination:*

- HPS for basic lighting and heat

- LED for spectrum supplementation

- Best of both worlds

- Higher complexity and costs

*CMH (Ceramic Metal Halide):*

- Compromise between HPS and LED

- Better spectrum than HPS

- More efficient than