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Jan 08, 2013, 12:05 PM
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Discussion

Do you need separate battery for your LED lights?!


Hi!

I run my hexcopter with 3s. My LED lights requires 12v. I only have 2 strips (around 25- 30 LEDs). I'm worrying if i will get lower flight time when i run this using the same battery pack. I know that LEDs have very low wattage.. so i'm not sure if i will notice the difference.

Need help! Thanks!
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Jan 08, 2013, 01:05 PM
Registered User
Quote:
Originally Posted by DYORD
Hi!

I run my hexcopter with 3s. My LED lights requires 12v. I only have 2 strips (around 25- 30 LEDs). I'm worrying if i will get lower flight time when i run this using the same battery pack. I know that LEDs have very low wattage.. so i'm not sure if i will notice the difference.

Need help! Thanks!
Even assuming they are about 0.2 W each (which is REALLY bright, probably more than 5x how bright they actually are), you'd only be using about 6W total, which likely won't make more than a 1 or 2% change in battery life.
Jan 08, 2013, 01:15 PM
Flying R/C since 1964
kallend's Avatar
Quote:
Originally Posted by DYORD
Hi!

I run my hexcopter with 3s. My LED lights requires 12v. I only have 2 strips (around 25- 30 LEDs). I'm worrying if i will get lower flight time when i run this using the same battery pack. I know that LEDs have very low wattage.. so i'm not sure if i will notice the difference.

Need help! Thanks!
I tested mine - nearly 2m of LED ribbon. Consumed 13mA.h of charge per minute, about 5% of what the motors consume.
Latest blog entry: Using a DX9 to "strobe" LED...
Jan 08, 2013, 01:49 PM
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Quote:
Originally Posted by kallend
I tested mine - nearly 2m of LED ribbon. Consumed 13mA.h of charge per minute, about 5% of what the motors consume.
If the calculations I just did in my head are right, that's around 9 watts or so of power, which would be around 4.5W per meter. Not quite sure how many they put per meter, but for my estimates to be correct, that's around one ever 4cm (which isn't really that much when I think about it). Still, how bright are those LEDs? Because a thing of LED strips that bright could almost be used as a flashlight.
Jan 08, 2013, 03:04 PM
Flying R/C since 1964
kallend's Avatar
Quote:
Originally Posted by sodaant
If the calculations I just did in my head are right, that's around 9 watts or so of power, which would be around 4.5W per meter. Not quite sure how many they put per meter, but for my estimates to be correct, that's around one ever 4cm (which isn't really that much when I think about it). Still, how bright are those LEDs? Because a thing of LED strips that bright could almost be used as a flashlight.
They aren't the super bright LEDS.

I also bought 2 (1 red, 1 white) very bright LED flashers from the local bike store. They are designed to strap on to handlebars or seat pillars (thin silicone rubber straps). Very light, include switch and long life battery, mount easily to the bottom plate. Can see them from long way off.
Latest blog entry: Using a DX9 to "strobe" LED...
Jan 08, 2013, 07:19 PM
Registered User
Thanks.... I only have two 5" strips for the front arms. Now I'm thinking of putting some more if that won't cost me 1min. of my flight time.
Jan 15, 2013, 12:13 AM
Registered User
Anyone have details on how to wire the LED Flasher?
Ive seen notes that you have to add a resistor and a NPN transistor, but the details on what type of resistor and transistor plus the configuration of the wiring has me confused (what leads plug where).
Jan 15, 2013, 08:12 AM
Registered User
I bought 12volt led strips from a motorcycle shop nearby. As long as you use 3s (12.6v when fully charged) battery, you can solder it parallel to the battery.
Jan 15, 2013, 08:29 AM
Registered User
Quote:
Originally Posted by DYORD
I bought 12volt led strips from a motorcycle shop nearby. As long as you use 3s (12.6v when fully charged) battery, you can solder it parallel to the battery.
Yeah, I that's the easy way, but I would like to be able to toggle on and off via TX. I understand the code, just not the proper connections. It's not very well documented.


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