Re: [Phys-L] Making video content with incandescent light and 100Hz bands problem

[John Denker <jsd@av8n.com>]

On 05/13/2012 01:28 PM, Derek Chirnside wrote:
> I've thought of getting a DC setup, but bulbs cost much more.  Like $27
> rather than $2.

Around here you can get 12V 50W bulbs for 2 or 3 bucks.
  http://www.google.com/search?tbm=shop&q=12v+50w+bulb

FWIW you can get lots of closely-regulated 12V power by 
cannibalizing the power supplies from old, cast-off desktop 
PCs.  An ATX power supply should be good for 100W at 12V,
sometimes much more, e.g. if the box was meant to support 
lots of disk drives.

This works better than "battery charger"-type power
pods, which tend to have unreasonable amounts of ripple.