I'd like to challenge everyone here that makes useful things.

I'd like to challenge everyone here that makes useful things.  I'm rebuilding an old light fixture and I'm focusing on efficiency.  

My challenge is to get the highest amount of lumens with the lowest number of watts. 

I'm stuck and I'd be willing to put a cash prize on this.

I'd like for everyone that gives this a try to stick to DC voltage.

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hehehe, laser pointed at a diffuser. anyway what kind of bulb does that thing use?
00MrNotWrong00 (author)  nutsandbolts_647 years ago
I made an instructable https://www.instructables.com/id/LED-bedside-lamp/ Laser pointers actually use a lot of power , the one I use to play with my cat never lasts more than an hour or two. Check out my ible and if you want one of those bulbs pm me for a link.
00MrNotWrong00 (author) 7 years ago
That's what I'm talkin bout !!!!! Lots of light , little watts , sorry it took so long , life has been crazy . The ratio to beat is 420 lumins / 5 watts . That's 84 to 1. I know it can be done , and I still have that 100 bucks, my build cost a total of 50 dollars so if you do it for around the same price you will walk away with a really cool light and 50 bucks. I'm going to make an instructable for this as soon as I finish the one for my solar furnace .
00MrNotWrong00 (author)  00MrNotWrong007 years ago
I made an instructable https://www.instructables.com/id/LED-bedside-lamp/
00MrNotWrong00 (author) 7 years ago
I just got the 20 dollar light and O.M.G. it is so bright,  totally not a typo,  or a misprint.  It's not really useful at the moment but as soon as I get a few reflectors on it and a nice shade,  I'll be posting lots of pictures and adding an instructable on this topic.

Wow,  very bright .
Do you have any way to confirm how much power it's using?  Maybe an ammeter in series?
00MrNotWrong00 (author)  kelseymh7 years ago
I have a friend that has a fluke meter but right now I have it hooked up to two 6 volt lantern batteries,  I know they are limited to three amps.

How many amps is 5 watts @ 12 volts ?  I could put a fuse for that value in the line and if it does not burn out then we will know that it's over.

Man it's bright !
00MrNotWrong00 (author)  00MrNotWrong007 years ago
Well that's not going to work,  seeing as I don't think they make a fuse for  0.4166666666666666666666666666666667  guess we'll have to wait till I can get my hands on my friends fluke meter.
00MrNotWrong00 (author) 7 years ago
Well I think this comes out to 4.2 watts,  but like I said before,  I'm not the best with the math.ledsupply.com/creemce-w430.php

If anyone knows of anything with a better ratio please don't be shy.
kikiclint7 years ago
 So a 100 watt lightbulb puts out about 1600 lumens, and a 23 watt cfl should put out the same.  If you took cgi.ebay.com/5-x-3W-High-Power-White-star-LED-130Lm-3-watt-lamp-5pcs-/320523081829, 3 watts with 120-130 lumens for 1-3$ each, to get the same results you would need 12 leds at 35-36 watts total.  The 10 watt led is 700 lumens, and 20 watts is 1500.   Price is about a dollar a watt, and you can choose between the warm white and regular white.  They even sell bulbs in the 3 watts range pre made. 
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