Originally Posted by honda03842
Jack, I went out and tested the temperature of our LEDs using the touch method. (The maximum temperature that one can keep their fingers in contact with something is between 114 and 120 degrees F.) I turned our lamp on for 5 minutes and was able to keep two fingers on the LEDs.
Have to take it up with Rat Shack, Norm. You can each check the calibration of the "digits" on your--uh--instrumentation. I believe both you and I purchased the same 36 element bulbs but perhaps not. It is possible that the aluminum hood or nozzle is both collecting and holding heat on my 36s. I tried the rule of [scorched] thumb and I am too wimpy to keep my paws on the end elements of those for even 5 seconds. The elements in the 36s are larger in area than those in the 68s which I have. I took the plastic shields off the dome lights over the sink and I could keep thumb and forefinger on the 68s for 5 seconds but wouldn't have enjoyed 10 seconds. Not quite like leaving your fingerprint stuck to bearing cap but uncomfortable. After five minutes the 68s read 122F on the Ratshack thermometer.
I believe you will find that the lumens game with these is counterintuitive. I was told by the seller Shun Tam that his 36s produce more "light" than his 45smds. I'm not an electrical
"train driver" but think that generally where there's light
there's heat (resistance is resistance no matter whether in chips or wires). I checked the size of the elements in his illustration of the 45smd bulb and as expected they were smaller than those of the 36. So light
and heat should correlate with total surface area of the smds and perhaps the 68s which I have also have a smaller total area of "smuds" than do the 36s which I have. One possibility of using a descriptor or rating based on number of light-producing elements (this n that quantity of smds) is that the potential customer will assume a higher no. promises a higher level of illumination and buy, say, a very long tower bulb with 102 elements and really not get that much more illumination. I'm betting the real correlation is to price of the bulb (the 45s were cheaper than the 36s, as were the 68s from a different seller). What think you?