Low voltage lighting

[Anguz]

I have built an off grid cabin, that the other half is gonna work from
I have solar and at the moment a 12v invertor that is running a 2ft square suspended ceiling panel that is giving enough light... maybe 6000lumens?
Obviously it would be more efficient to run 12v led lamps
None of the suppliers I have found seem to list lumen output of their lights
Any suggestions?

 

[brightspark]

Lumens to Watts Conversion Chart: Choose the Right LED Bulb

The old days of selecting light bulbs by wattage are over. Use our lumens to watts conversion chart to choose the right LED bulb every time.

www.voltlighting.com

 

[voipio]

The chart, in the link above, doesn't match the presently used figures for LED lamps, though it's not far off. Based on the packaging from recently bought LED bulbs, the manufacturers seem to have standardised on the following:

Incandescent (Watts) ---- Lumens ---- LED equivalent watts
40 ---- 470 ---- 4
60 ---- 806 ---- 6
100 -- 1521 -- 14.5

So the 6000 lumens of the ceiling panel would be roughly equivalent to 400W of incandescent lighting, or about 60W of LED.

 

[Anguz]

That reads about right... off the top of my head I think the flat panel claims to be 55w
I did measure the voltage from its driver module... about 50v.. did consider rewiring the panel for 12v, but not sure if the driver is constant volts or constant current

 

[voipio]

LEDs are generally driven by constant current sources, since the voltage/current relationship for the LED chips is not linear. They behave more like Zener diodes, albeit with quite a large slope.

 

[gaz1]

the bulb i have is 1530 lumen 15w equal to a 100w bulb but the light of it is more like a 150 bulb

this bulb is warm light not bright light i find that too bright