Super Bright Red 5mm LED 4000 mcd 100 Piece Kit with Voltage Dropping Resistors
Super Bright Red 5mm LED 4000 mcd 100 Piece Kit with Voltage Dropping Resistors is rated out of 5 by 3.
Rated 4 out of 5
from A good deal all the way around for most normal useI bought this as part of a project to build LED grow lights. The price is certainly great! The LEDs used with the resistors included do work well but they produce a bit more heat than I would like. I think 1/2 watt resistors would be a better match and produce less heat.
Date published: 2015-02-16
Rated 5 out of 5
from Versatile bright LED'sI bought the Super Bright Red LED 100 piece kit along with the similar Super Bright Blue LED 100 piece kit to replace the original incandescent locator & pilot lamps in the switches of a 1960's era GE Low Voltage Relay Controlled Lighting System. Previous LED's tried were not bright enough, but these exceeded my expectations! The power supply is a 24 VAC transformer with bridge rectifier & filter cap., with 32 VDC open circuit output. I used 10K, 1/4 W current limiting resistors because I have a large qty. & found that brightness was only slightly reduced @3 MA current. The red LED's brightness is about right for the pilot lamps; the blue LED locator lights are brighter than necessary but certainly are easy to locate in a dark room!Since lightning was the primary cause of incandescent lamp failure, I hope the high series resistance & LED current rating will reduce that failure mode.
Date published: 2014-05-13
Rated 4 out of 5
from Quite nice, considering the priceAlright, since I was hesitant to buy these because of the lack of reviews, I guess I'll go ahead and write one. I've only lit about 10 out of the 100 LEDs that come in the pack so far, and all 10 seem to be rather consistent. The leads of the LEDs are a little on the weak side, but that isn't really an issue unless you plan on needing to re-do something over and over (and even then, might as well just buy another pack). No problems with DOA just yet. These are bright enough that looking directly at them in a fully lit room will still be uncomfortable, slightly blinding. There is also a little bit of light that is emitted from the side of the LED. That could be an issue if the LED is installed with the sides fully visible. Also, the spec saying 15 degree viewing angle seems to be fairly accurate, but I didn't pull out a protractor. I asked the supplier for a data sheet and they said there isn't one. (lol wut)The LEDs come in a sealed anti-static pouch. There are also two bags of resistors (180ohm and 500ohm I believe) included for driving the LEDs with either a 5v or 12v source. This is the only problem I've come across so far: when using the 500ohm resistor and a 12v source, the resistor gets rather hot to the touch. (If you do the math, that resistor is dissipating 0.2W) I can't really tell if they are 1/4W or 1/8W spec'd resistors, so it is either out-of-spec or just at the edge. My solution to this is just putting 2 or 3 LEDs in series with just one resistor.In summation:PROs- Cheap- Bright- Uh, cheap?CONs- leads a tad weak- 12v resistor gets hot- no data sheet- a small amount of side light leakage
Date published: 2011-11-21