Alaskan
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Those don't put out much light, but they would light up the back end to be a nice glowing red. If you want to throw out some light, try 1, 3 or higher watt output LED's. I guess your limit on the power output of the LED is the battery you use and if you want the LED to stay on for very long, also the size of the heat sink.
Here's a 1 watt red LED I found on ebay you might consider but might need a heat sink. If it needs one it probably won't need to be very big at this power:
5pcs 1W High Power LED Red Light Lamp Bulb Beads 40 50LM 2 0 2 2V 1watt Free P P | eBay
This LED might be the right fit for your project, no heat sink required:
http://www.ebay.com/itm/New-Product...130340?pt=US_Car_Lighting&hash=item43d1690824
Here's a 1 watt red LED I found on ebay you might consider but might need a heat sink. If it needs one it probably won't need to be very big at this power:
5pcs 1W High Power LED Red Light Lamp Bulb Beads 40 50LM 2 0 2 2V 1watt Free P P | eBay
This LED might be the right fit for your project, no heat sink required:
http://www.ebay.com/itm/New-Product...130340?pt=US_Car_Lighting&hash=item43d1690824
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