When selecting an efficient lighting, it's a good idea to understand basic terms and principles of lighting. Also, it helps to explore your lighting options for indoors or outdoors if you haven't already. This will help narrow your selection.
Types of lighting include:
* Incandescent lighting
* Fluorescent lighting
* High-intensity discharge lighting
* LED lighting (light-emitting diodes)
* Low-pressure sodium lighting
* Outdoor solar lighting
You can use the chart below to compare the different types of lighting.
Lighting Type | Efficacy (lumens/ watt) | Lifetime (hours) | Color Rendition Index (CRI) | Color Temperature (K) | Indoors/ OutdoRR |
---|---|---|---|---|---|
Incandescent | |||||
Standard "A" bulb | 10–17 | 750–2500 | 98–100 (excellent) | 2700–2800 (warm) | Indoors/ outdoors |
Tungsten halogen | 12–22 | 2000–4000 | 98–100 (excellent) | 2900–3200 (warm to neutral) | Indoors/ outdoors |
Reflector | 12–19 | 2000–3000 | 98–100 (excellent) | 2800 (warm) | Indoors/ outdoors |
Fluorescent | |||||
Straight tube | 30–110 | 7000–24,000 | 50–90 (fair to good) | 2700–6500 (warm to cold) | Indoors/ outdoors |
Compact fluorescent lamp (CFL) | 50–70 | 10,000 | 65–88 (good) | 2700–6500 (warm to cold) | Indoors/ outdoors |
Circline | 40–50 | 12,000 | Indoors | ||
High-Intensity Discharge | |||||
Mercury vapor | 25–60 | 16,000–24,000 | 50 (poor to fair) | 3200–7000 (warm to cold) | Outdoors |
Metal halide | 70–115 | 5000–20,000 | 70 (fair) | 3700 (cold) | Indoors/ outdoors |
High-pressure sodium | 50–140 | 16,000–24,000 | 25 (poor) | 2100 (warm) | Outdoors |
Light-Emitting Diodes | |||||
Cool White LEDs | 60–92 | 35,000–50,000 | 70–90 (fair to good) | 5000 (cold) | Indoors/ outdoors |
Warm White LEDs | 27–54 | 35,000–50,000 | 70–90 (fair to good) | 3300 (neutral) | Indoors/ outdoors |
Low-Pressure Sodium | 60–150 | 12,000–18,000 | -44 (very poor) | Outdoors |
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