Plastic package LEDs vs ceramic package leds...difference?

[treez]

Hello,

I am trying to compare the XPEHEW White LED and the MX6AWT white LED from Cree.

XPEHEW is a ceramic package LED
MX6AWT is a plastic package LED.

What's the difference?...why would you choose a ceramic package over a plastic package?

XPEHEW LED datasheet:
**broken link removed**

MX6AWT LED datasheet:
**broken link removed**

 

[D.A.(Tony)Stewart]

The XPE are less expensive due to smaller size & lower power capability but sealed and may be more reliable in moist areas.
XPE are 175mA max.
MX6 are 350mA max.

If you compare two XPE with one MX6, the plastic MX6 comes out cheaper in terms of $/Lumen

 

[treez]

sorry but they are both 1A LEDs. MX6 is much cheaper than XPEHEW.

 

[D.A.(Tony)Stewart]

1A only applies if you can support the heatsink required.

XP-E starts at $1.79 @1k and has the advantage of Rjc=6 °C/W and 3.27W @ 1A
while MX-6 starts at $0.73 4.1W and Rjc= 5 °C/W but these do not have equal performance. I would not operate these at 1A steady.

the choice between the two has many subtle parameters with lumens at actual operating temperature dependant on junction temp and cost of MCPCB and heatsink vs LED.

MX-6 has worse Vf but better Rjc with lower lumen but lower cost. so it depends on your priority for cost or performance.