fedcas
Newly Enlightened
Hi everyone,
i haven't found much information about XT-E but i think it's a pretty interesting LED, in particular, i think it's worth considering it as an alternative to the XP-G2.
Both are rated at exactly the same @ 350 mA:
Flux (lm) @ 85 °C: 139 lm
(Cool White R5 @ 350 mA)
The main point of the XT-E should be the different emispherical emission, due to the particular shape of the inner optics:
comparing the polar distribution from the datasheets:
so basically the XT-E has more side emission and the hotspot slope is more linear
it is slightly less efficient, but the difference is less than 2% at 350mA. The voltage gap gets relatively bigger at higher currents though.
also, the output at 350 mA is identical, but again it gets quite lower at higher driving currents.
So i would say i'ts an interesting alternative for low driving currents. I swapped the XP-E of my Black Diamond Storm with an XP-G2 to get more flood and more efficiency, but i'd still like a bit more flood and also i got a slight blackhole in the hotspot. According to the graphs, I guess i should have improvements on both sides if i swap the XP-G2 with the XT-E... and the driving current is around 400 mA so the efficiency should not be affected. I have an XT-E right next to me... i'll post a beamshot comparison afterwards
i haven't found much information about XT-E but i think it's a pretty interesting LED, in particular, i think it's worth considering it as an alternative to the XP-G2.
Both are rated at exactly the same @ 350 mA:
Flux (lm) @ 85 °C: 139 lm
(Cool White R5 @ 350 mA)
The main point of the XT-E should be the different emispherical emission, due to the particular shape of the inner optics:
comparing the polar distribution from the datasheets:
so basically the XT-E has more side emission and the hotspot slope is more linear
it is slightly less efficient, but the difference is less than 2% at 350mA. The voltage gap gets relatively bigger at higher currents though.
also, the output at 350 mA is identical, but again it gets quite lower at higher driving currents.
So i would say i'ts an interesting alternative for low driving currents. I swapped the XP-E of my Black Diamond Storm with an XP-G2 to get more flood and more efficiency, but i'd still like a bit more flood and also i got a slight blackhole in the hotspot. According to the graphs, I guess i should have improvements on both sides if i swap the XP-G2 with the XT-E... and the driving current is around 400 mA so the efficiency should not be affected. I have an XT-E right next to me... i'll post a beamshot comparison afterwards
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