Comparison of lighting for PlantedTank.net
This article is designed to compare several popular lighting types in terms of power (Watts) and light (Lumens) only. Issues such as spectrum and lighting selection will not be addressed.
Link to WPG: Lighting: the WPG rule
Eric Olsens comparison: Lighting Level for Aquatic Plants
Energy/area method: foot-candles, lux, lumens, sunlight, PAR
DIY (do it yourself) projects have an inherent risk above standard operation. Any DIY ideas mentioned here are for completeness only and does not constitute and endorsement. Water and electricity do not mix!
Guides the PAR/PUR alternative for can be found at light compare
and DefBlog - PUR-efficiency list
Total intensity is expressed as lumens (lm).
Power as Watts (W).
Power levels: Normal Output (NO), High Output (HO), Very High Output (VHO), and Over-Driven Normal Output (ODNO)
* Quote: Buy Tools, Lighting, Electrical and DataComm Supplies at GoodMart.com
# fluorescent bulbs = 4,
## (high, - (quoted) - low), lm/W from mean value
### multiplier of intensity to compare T12. Ie 28W T5 = 1.37 W T-12.
Example 2 WPG T5 = 2.74 WPG T12.
Operation described here: Diagram of a Light Bulb
Aquarium 15 W bulb ~7.4 lm/W.
Linear fluorescent lamps
Operation described here: How do Fluorescent Lamps work?
Bulb diameter: T-12 -> 12 one-eighths or 1.5. (T8 = 1)
Medium bipin contacts used for T12 NO, T10, T8 and T6 in standard lengths.
From ~3000K to 6700K
T12 High Output variants: The HO and VHO T12 lamp use recessed double contact to prevent interchange and operate by increasing the current (T12 NO = 430 mA, HO = 800 mA, VHO = 1500 mA)
T5 High Output variants: The T5 and T5 HO use the same miniature bipin contact but require a load sensing ballast.
Ballast power factor is the ratio of the lamp design current over the supplied ballast current.
For example a energy saving T12 ballasts can have 0.88 power factor resulting in 2775 lumens X 0.88 = 2376.
Fluorescent lamps can be overdriven with a high power factor ballast, or creative wiring. Over-Driven Normal Output ODNO is covered in depth here: www.plantedtank.net/odno.html
Rule of thumb is 2X = 50%, 3X = 75% lm, 4X = 100% increase.
The member Shalu notes that some combinations actually become more efficient when OD. Suggested that 2x OD 18" T8 outputs 2.5x light!
Spiral Compact as screw in type. Total lm quoted, expect significant loss to restrike.
Reports that power compact (PC) are bent T5 with 55/66W power dependent on ballast, not bulb.
HID operation: How does an HID lamp work?