You can find LEDs for 12V in Conrad.nl or similar those should be economical and your battery should last for a while. Such as: 852149-8A LED-Gloeilamp T10 12V Rood --- On Thu, 11/26/09, Jean-David Beyer <jeandavid8@xxxxxxxxxxx> wrote: From: Jean-David Beyer <jeandavid8@xxxxxxxxxxx> Subject: [pure-silver] Re: Now this realy an Off Topic question.. To: pure-silver@xxxxxxxxxxxxx Date: Thursday, November 26, 2009, 12:28 PM C.Breukel@xxxxxxx wrote: > I have this really off topic question, there is a faint connection to > pure silver though..;-).. > > Since a year or so I am quite heavy into wet plate collodion > photography, I'll spare you the details, but basically you prepare and > process a light sensitive plate with silver halides (see pure > silver..;-)..) in the field. > > After exposure plates have to be developed immediately, so you need a > what is called a darkbox. Since the emulsion is only sensitive to blue > and a bit of green light you can work under red light. I am building > this box in my car. > > Now my question is: how long can you run a low wattage (red) bulb from > your car battery before you drain said battery and are unable to start > the car again? > If you use some red LEDs, enough so you can see what you are doing, I imagine whatever power source you use will last longer than if you use an incandescent bulb. -- .~. Jean-David Beyer Registered Linux User 85642. /V\ PGP-Key: 9A2FC99A Registered Machine 241939. /( )\ Shrewsbury, New Jersey http://counter.li.org ^^-^^ 06:25:01 up 19 days, 12:59, 3 users, load average: 4.52, 4.55, 4.39 ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.