"Anyone who claims they have seen a significant temperature difference with the same wattage is either mis-measuring, or not using similar wattage. "

Oh, now, I wouldn't say that!

Aloha, vannewb

While you are spot on about Watts is Watts, you are overlooking a basic mechanism.


Most light sources radiate a lot of heat.

With leds the heat is produced by the diode which is tightly bonded to a heatsink.
I have a fan drawing the heat from the 'sink at the back of the lamp and I pump it out of the room before the room even knows it's there.

That is easy to do, with leds.:thumbsup:

Hps, even with a cool-tube, radiates much of it's heat into the room as IR, right through the cool-tube, where it is much more difficult to remove before it can cause problems.

So, I do claim, and can document, a significant temperature difference with similar wattage.

I am not mis-measuring.
I am taking advantage of the nature of the LED.

Narrow spectrum light that is ideal for photosynthesis. is all that I'm pumping into the room.
And the best part is, I'm putting 0 watts into less efficacious wavelengths, and almost none into radiated heat.

Jus' my 2 cents,
Aloha,
Weeze