For a long time i have been trying to replace the very energy wasting 500W halogen floodlights i have lighting my showroom facade with an LED version but till now LED's were not up to it, until the XR-E arrived, and here are the results:
7 XR-E's AA'ed to a 10cm x 15cm x 1cm aluminium plate
close up Very Underexposed
close up Still Very Underexposed
Actual ( this is a small room )
I have them connected in series to a 24V wallwart type power supply having a max of 1.5A.
So when cool the LED's were getting 3.5V @ 700mA each but after an hour they are getting 3.33V @ 1.05A each. the plate did get hot at 64 deg Celcius after an hour so that might be the culprit but im not complaining as there was an increase in the output
so according to the Cree data sheet and Newbie's study i should be getting 1260 Lumens @ 24.5W but im loosing about 20% due to the junction temp being a bit high so now it should be about 1000 Lumens !!
I'm gonna put this monster inside the housing of a halogen floodlight which will not help with the heat so i have to add some heatsinking and find a way to transfer the heat to the floodlight housing.
This will not directly replace a 500W Halogen floodlight in terms of output but it will be enough light for me as i will be using two of these, plus i will be saving $25 a month in electricity bills.
Thanks for looking.
7 XR-E's AA'ed to a 10cm x 15cm x 1cm aluminium plate
close up Very Underexposed
close up Still Very Underexposed
Actual ( this is a small room )
I have them connected in series to a 24V wallwart type power supply having a max of 1.5A.
So when cool the LED's were getting 3.5V @ 700mA each but after an hour they are getting 3.33V @ 1.05A each. the plate did get hot at 64 deg Celcius after an hour so that might be the culprit but im not complaining as there was an increase in the output
so according to the Cree data sheet and Newbie's study i should be getting 1260 Lumens @ 24.5W but im loosing about 20% due to the junction temp being a bit high so now it should be about 1000 Lumens !!
I'm gonna put this monster inside the housing of a halogen floodlight which will not help with the heat so i have to add some heatsinking and find a way to transfer the heat to the floodlight housing.
This will not directly replace a 500W Halogen floodlight in terms of output but it will be enough light for me as i will be using two of these, plus i will be saving $25 a month in electricity bills.
Thanks for looking.
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