Post subject: Re: Homemade LED and portable Refractometer lamp
Posted: Thu Feb 07, 2013 8:32 am
Active Member
Joined: Sat May 21, 2011 7:09 am Posts: 77 Location: Italy
Hi Tim,
you found nice 590nm led, good viewing angle. They run with 12v as you need, and they are more expensive than the "standard led requiring resistor" because there are 4 leds and a resistor inside. So, for question 1 you are right.
Question 2: I will prefer the led type you found.
About spectroscopy light, sometimes I use white led light: it fit for blue region evaluation. My opinion, use a switch for bulb light or white led light.
About to reduce voltage from 12v to 3v, the correct way is using a stabilizer integrated circuit:
Post subject: Re: Homemade LED and portable Refractometer lamp
Posted: Thu Feb 07, 2013 1:21 pm
Platinum Member
Joined: Tue Jan 02, 2007 8:20 pm Posts: 2659
Quote:
So it's not as easy as soldering a certain resistor in between the 12v input and the 3v xenon bulb?
That will work but is a very crude and inelegant way of doing it. Even using an IC regulator as above you will waste ,as heat three quarters of the power. Just get the right size power supply. Not a moon shot.
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