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4hv.org :: Forums :: General Science and Electronics
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Plexi glass and lighting.

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Ken M.
Sun Apr 22 2007, 01:24AM Print
Ken M. Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
As many know CH_R is the best crafter of plexi glass on the forums,(there may be others but I haven't seen many) and after seeing his use of LED's embeded into the glass, as well as doing it to some exstent with my TC project I decided to try some of the other LED's I had sitting around and find out the subsequnt colors and effects the had when lighting plexi glass.

Here is Plexi glass with 1 UV LED implanted.

SD530272


Here is a Red LED.

SD530270


Heres (My favorite) a Blue LED.

SD530269


Lastly a Green LED.

SD530268


Each LED is a clear lens ~10,000MCD brightness.
Also I was just using a 1k resistor and a 9v cell.
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ragnar
Sun Apr 22 2007, 02:22AM
ragnar Registered Member #63 Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
The forward voltage drop of most blue/green/white LEDs is around 3.6V

(9.0V - 3.6V) / (0.02A) = 270

Try a 270-ohm resistor instead.
1177208551 63 FT24138 Elsingle3

1177208551 63 FT24138 Elsingle4
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Ken M.
Sun Apr 22 2007, 03:06AM
Ken M. Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
I was more concerned about over powering it, plus 1k was the resistor I had on hand, besides all the LED's where used with gator clamps, for quick way to connect them to the power source and be able to interchange each 1 pretty quickly, especially considering all my LED's got mixed up and are in 1 pile, and since they all have clear lenss...I have no way of telling what color each LED will produce untill I power it.
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