I'm nearly finished with a new Triple Seoul Semiconductor P4 LED bike light. So tonight I went out and took a beam shot to compare it to my Triple Cree XR-E light and thought I'd share the results with you.
The light housings are identical, so if you're curious about that, go look at the thread on the Triple Cree light. Both are driven at 1Amp. The Triple Cree uses Ledil lenses while the Triple SSC P4 uses IMS-20 reflectors (2 of which I've modified to produce more spill).
The top photo is the Triple Cree, the bottom is the Triple Seoul. (same manual camera settings of course)
One thing I notice is that I did manage to get a more even spill from the Seoul setup. Notice that to the left of the tree is dark with the Cree light, while you can still see the fence with the Seoul. There are several factors at play here, since one light is using lenses (1x4, 2x9 degree) and the other is using reflectors (that were meant for Luxeon emitters).
Since I couldn't get the Seouls mounted on stars, I used emitters, which made things a little more difficult, but not impossible.
Below is the IMS-20 reflector arrangement that I used (the front edge of the outer reflectors was sanded down).
Other notes: the SSC P4 emitters are all U-binned which are advertised to output between 91 and 118 lumens @350mA. I'm driving them at 1A which, according to the Seoul Semiconductor technical documentation, should cause them to glow at about 200 lumens (assuming my emitters are at the bottom-end of the binning range). Multiply that by 3, and it should be around a 600 lumen bike light (minus any other losses in the reflectors and/or thermal degradation).
The Triple Cree has been a great light this season. I will give the Triple Seoul a test ride or two this week and let you guys know how it works out and compares on the trail.
Oh yeah. I forgot to add this link to my DIY LED Bike Light Guide web site, where you can get more info and detailed steps if you're interested in building one of these for yourself. The site is not completely finished, but it has enough info there to help you build the light.
The light housings are identical, so if you're curious about that, go look at the thread on the Triple Cree light. Both are driven at 1Amp. The Triple Cree uses Ledil lenses while the Triple SSC P4 uses IMS-20 reflectors (2 of which I've modified to produce more spill).
The top photo is the Triple Cree, the bottom is the Triple Seoul. (same manual camera settings of course)
One thing I notice is that I did manage to get a more even spill from the Seoul setup. Notice that to the left of the tree is dark with the Cree light, while you can still see the fence with the Seoul. There are several factors at play here, since one light is using lenses (1x4, 2x9 degree) and the other is using reflectors (that were meant for Luxeon emitters).
Since I couldn't get the Seouls mounted on stars, I used emitters, which made things a little more difficult, but not impossible.
Below is the IMS-20 reflector arrangement that I used (the front edge of the outer reflectors was sanded down).
Other notes: the SSC P4 emitters are all U-binned which are advertised to output between 91 and 118 lumens @350mA. I'm driving them at 1A which, according to the Seoul Semiconductor technical documentation, should cause them to glow at about 200 lumens (assuming my emitters are at the bottom-end of the binning range). Multiply that by 3, and it should be around a 600 lumen bike light (minus any other losses in the reflectors and/or thermal degradation).
The Triple Cree has been a great light this season. I will give the Triple Seoul a test ride or two this week and let you guys know how it works out and compares on the trail.
Oh yeah. I forgot to add this link to my DIY LED Bike Light Guide web site, where you can get more info and detailed steps if you're interested in building one of these for yourself. The site is not completely finished, but it has enough info there to help you build the light.