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CFL bulbs give number for how many watts they use, but also give a number of watts, pertaining to an 'equivalent' incandescent bulb. People see the numbers they are familiar with, and generally disappointed with the performance. Suspect LED replacement bulbs do the same, but are much worse, since the light is more direction. I've also seen some 10w LEDs, but were multiple LEDs on the same die, lots of heat, expensive failure...
That is the problem with my project right now. Not getting the brightness I need.
I am using 20K mcd LEDS. 5mm driven directly from 220V @ 20Ma.
24 of them driven with a very simple reliable circuit. The high power LED'S want a minimum of 350 Ma. My simple /cheap/reliable PSU can only accommodate around 30 Ma. So basically..I am (swearing removed). Damn.
Much more work on my side is necessary.
Cheers
No!LED's are brighter when pulsed.
Only if the off time allows for cooling.They last longer when pulsed.
Of course because they are turned off for some of the time.They use less energy when pulsed.
But if you pulse an LED then you must increase the current for it to be seen as bright as a continuous LED at a much lower current. Increasing the current increases the forward voltage that increases the anount of heat. Also look at the high current used for a multiplexed display to be seen brightly.Also, when you drive them with a high current, they will not last long and they will produce a lot of heat.