cipi-cips
Member level 4
Hello,
I dont know is this is good place to post this question but it is part of my homework,
I was suppose to calculate how many LED chips should I use and get total lumens for 20W LED lamp. I have two types of chips, one is from cree and second one is from samsung. I need to use 700mA, 4000K, 80CRI.
1.https://www.cree.com/led-components/media/documents/XLampMKR.pdf
2.https://dtsheet.com/doc/1542101/data-sheet---lh351b
first problem I get is how many lumens per watt is. From CREE datasheet page 12 I took this H4 which gives 970 lm, if voltage is 11.7 and current 700mA that is 8.19W and 970 lm / 8.19W is 118,43 lumens per watt. Is this correct calculation ?
and if I do the same for samsung datasheet from page 5 I took this chip M3 where is written 252 lm @ 700mA, is this number 252 lumens per watt or per chip ?
Regards
I dont know is this is good place to post this question but it is part of my homework,
I was suppose to calculate how many LED chips should I use and get total lumens for 20W LED lamp. I have two types of chips, one is from cree and second one is from samsung. I need to use 700mA, 4000K, 80CRI.
1.https://www.cree.com/led-components/media/documents/XLampMKR.pdf
2.https://dtsheet.com/doc/1542101/data-sheet---lh351b
first problem I get is how many lumens per watt is. From CREE datasheet page 12 I took this H4 which gives 970 lm, if voltage is 11.7 and current 700mA that is 8.19W and 970 lm / 8.19W is 118,43 lumens per watt. Is this correct calculation ?
and if I do the same for samsung datasheet from page 5 I took this chip M3 where is written 252 lm @ 700mA, is this number 252 lumens per watt or per chip ?
Regards