I would like to preset my experience of Using SHILAN H4 CREE 30w LED bulbs on my i10 Blue Boy.
1> Instant ON helps a lot. One may feel Even Halogens are instant ON, However only after upgrading to LED one can understand how Fast LED is. The LED develops full output in a split second, while Halogens ramp up a wee bit slower. Even Shift to High-low is instant with LEDs.
2> The Beam pattern with LED was my biggest concern. However, i am utterly pleased to report that LED has maintained the factory headlight Beam pattern.
Hyundai uses slightly different beam pattern for Left & Right Headlamps. The Left hand pattern extends a little more into bushes & siding, also hotspot is a little taller. Cutoff at Right hand is flatter and slightly lower.
The Hyundai always had 'Soft' cutoffs that's more suitable for Mixed Indian driving conditions.
I am pleased that all these features have been carried over by LED bulb without any change.
3> The glare in Both Low or High beam is LESSER than Factory headlamps.
Yes, you read that right.
4> My High beam assists , which use a relay to gain trigger from high beam, still continue to work properly. The Trigger is taken by drilling a small hole in Dust cap, and attaching wires to High beam terminals of Bulb.
5> I am yet to drive in rain, so I will reserve my comment on that. I do not like the 6000k color of these LED bulbs. They do look nice though.
6> The total Light output currently on my Blue boy is as follows-
Cree LED H4- 2500x2= 5000 Lumens
HID Fog Lamps H27, 2800x2= 5600 Lm
Halogen h3 High beam assists- 1100x2= 2200 Lumens
The Low beam, Glare free output shall be about 10,000 Lumens.
7> My next upgrade perhaps will be to swap H3 halogens to Cree LED for better output & lower power.