Lighting Comparisons

Twin 28W T5 Fluorescent vs. 40W LED Direct Flat Panel

SpecificationT5 Fluorescent (twin tube)LED Direct Flat Panel
Power (W)5640
Lifetime (hours)2500050000
Efficiency (lm/W)8585
Luminous Flux (lm)50003400
Colour temperature (K)65005700/6500
Colour Rendering Index (CRI)8575
N.B. The value for T5 fluorescent power consumption does not include the power needed to drive the ballast.

 

This comparison applies to the business sector where these fittings are required to light offices and other communal areas. As twin T5 fluorescent tubes are needed the power consumption and luminous flux have doubled for comparison in the table. The LED direct flat panel outperforms the twin T5 fluorescents in lifetime and has lower overall power consumption. Efficiency is only comparable in the most advanced T5 fluorescent tubes. With respect to luminous flux, this value is high for a few months after installation. Fluorescent tubes experience decline in lumen output after a few hundred hours of operation. Although the T5 fluorescent has a higher CRI, the light generated by LEDs actually contains a greater number of colours from the light spectrum.

 

Twin 18W CFL Downlights vs. 16W LED 6" Downlights

SpecificationCFL Downlight (twin globe)LED 6" Downlight
Power (W)3616
Lifetime (hours)800050000
Efficiency (lm/W)6570
Luminous Flux (lm)23001008/1120
Colour temperature (K)27003000/6500
Colour Rendering Index (CRI)8575

This comparison applies to the business and residential sectors, where downlights are installed for general or feature lighting. For the CFL downlight, the values for power consumption and luminous flux have been doubled to reflect the need for twin globes. LEDs outclass CFL downlights in almost every aspect, the highlight is a reduction in power consumption by more than 50%. The reasoning for high luminous flux and CRI is the same as for the T5 fluorescents. Firstly, fluorescents only sustain that level of luminous flux for a short period of time before the lumen output declines. Secondly, although fluorescents have a higher CRI the emitted light is composed of fewer colours of the light spectrum in comparison to LEDs.

 

14W CFL Globe vs. 8W LED Globe

SpecificationCFL GlobeLED Globe
Power (W)148
Lifetime (hours)800050000
Efficiency (lm/W)6070
Luminous Flux (lm)850560
Colour temperature (K)27003000
Colour Rendering Index (CRI)8075

These products are primarily used to light homes. However, they are used in business for lamps and task lighting to replace 60W incandescent globes. LEDs are similar to CFL globes in most areas; the main points of improvement are in power consumption and lifetime. The higher power of the CFL allows for 850 lumen output, but this declines a few months after installation. The CRI for the CFL is marginally better, but the light from the LED is superior as it is made of more colours from the light spectrum.

 

50W Halogen Downlight vs. 6W LED 3" Downlight

SpecificationHalogen DownlightLED Downlight
Power (W)506
Lifetime (hours)300050000
Efficiency (lm/W)2055
Luminous Flux (lm)900297
Colour temperature (K)30003000
Colour Rendering Index (CRI)10075
N.B. The value for halogen downlight power consumption does not include the power needed to drive the ballast.

 

This comparison is relevant to the business and residential sectors where halogens are widely used for general and feature lighting. LEDs outperform halogen downlights in all specifications except luminous flux and CRI. The most substantial savings are in power consumption, lifetime and efficiency; for example our LEDs use 12% of the power in comparison to halogen downlights. The high power of halogens is the reason for high luminous flux and CRI. However, the short lifespan of halogen downlights means there are greater replacement and maintenance costs involved with this fitting. In the lifetime of one of our LED downlights you will use more than 16 halogen globes.