Lumens per watt

[John Dunkley]

Can someone please tell me how many lumens/watt a standard 36/40 household
fluoro is?

I am putting together a modest solar system and this will help me with my
lighting calculations. Am planning on using the compact 12v energy saver
lamps to replace the fluoro.

i.e. equivalent 60w energy saver Vs standard 40w tube fluoro.


Ta!

JD

 

[SJC]

Can someone please tell me how many lumens/watt a standard 36/40 household
fluoro is?

I am putting together a modest solar system and this will help me with my
lighting calculations. Am planning on using the compact 12v energy saver
lamps to replace the fluoro.

i.e. equivalent 60w energy saver Vs standard 40w tube fluoro.


Ta!

JD

Previous post had:
Current white LEDs: 30 lumens/watt
Incandescent bulbs: 15 lumens/watt
CFLs: 50 lumens/watt.

So I would imagine it is somewhere in that catagory.
I did not have any luck finding it on Wikipedia nor the web.

 

[Anthony Matonak]

Can someone please tell me how many lumens/watt a standard 36/40 household
fluoro is?

I am putting together a modest solar system and this will help me with my
lighting calculations. Am planning on using the compact 12v energy saver
lamps to replace the fluoro.

i.e. equivalent 60w energy saver Vs standard 40w tube fluoro.

I believe that since they use the same technology all fluorescent
lights will have similar lumens/watt. There will be some variation,
of course, but generally a 40W straight tube should produce the
same light as, say, two 20W CF spiral tubes.

Anthony

 

[Ken]

Can someone please tell me how many lumens/watt a standard 36/40 household
fluoro is?

I am putting together a modest solar system and this will help me with my
lighting calculations. Am planning on using the compact 12v energy saver
lamps to replace the fluoro.

i.e. equivalent 60w energy saver Vs standard 40w tube fluoro.

Fluorescent tubes are about 70-100 lumens/watt.
http://www.osram.com/products/general/fluorescent/3_1.html

 

[Dave]

Generally speaking fluoros are the most effecient light. However there are
some differences between brands, and the ballast or fluoro inverter in a 12-
24 volt unit may not run the tube to the tube manufacturers stated potential
ability.

Some only quote the tube manufacturers rating and don't test it on their
electronics. This link gives effeciencies for a number of 12 volt lights
that have actually been tested or verified.

http://www.rpc.com.au/products/lights/Lighting-Efficiency-Chart.pdf


OzDave
www.rpc.com.au

 

[Al]

Shouldn't take more than 6 days then...?

 

[John Dunkley]

See new thread I have started.

JD

Shouldn't take more than 6 days then...?

 

[Unknown]

What about the funky HID automobile headlights, can you get hps/lps
halide, etc? That would be pretty efficient and easy to use with DC. I'm
not sure if they're the real thing or just tinted halogen lights.

 

[TKM]

What about the funky HID automobile headlights, can you get hps/lps
halide, etc? That would be pretty efficient and easy to use with DC. I'm
not sure if they're the real thing or just tinted halogen lights.

The HID headlights are variations of what's called metal halide lamp
technology. There are also xenon lamp designs. They are certainly more
efficient (60-70 lumens/watt) than halogen headlights (20 lumens/watt); but
the driver gear is expensive and the lamp life, while longer than halogen,
is shorter than standard fluorescent lamps. You also have the problem of
light control. The HID headlamps are small and bright -- more suited to
generating beams of light than lighting a room.

The most efficient light source for 12 volt systems remains fluorescent used
with an electronic ballast (70-80 lumens/watt). LEDs are coming along from
the lumens/watt standpoint -- a 75 lpw device has been announced although
production devices are more typically 15-25 lpw. But light output and price
remain barriers to the widespread use of LEDs for general lighting.

TKM