Hiya Kev,
Oslon, Luxeon, or Cree are the top of the Wozza LED's for light bars with Oslon prob best.
Epistar is also OK but it could be argued maybe not quite as long lived however still acceptable if priced a fair bit cheaper.
For a forward facing "on road or on track" application spot is best or possibly combo if at least 50% are spot focussed.
Flood pattern are best for side or rear for bush tracks or general use.
1 x 10 watt LED has better range than 2 X 5 watt so IMHO for a vehicle a, say, 18 x 10 watt LED (180 watt total) is better than a 36 x 5 watt LED Bar (180 watt also) on a 'like for like' decision.
(edit) ... but, a quality bar using 5 watt LED's will be better than a not so flash one using 10 watt
On any bar over 30 inch I much prefer 2 or more mounts along the body rather than single mounts at each end.
I currently run a 24 x 10 watt spot bar on the roof of my Ute and up to maybe 80 to 90 KPH it is the only light needed.
Above 90 ish on the bitumen I find my 55 watt HID IPF's handy for that extra bit of range about 15 degrees either side of dead ahead into the spon drains etc.
Both IPF's are 'spot' as the 'flood' lens just got swallowed up by the LED bar but the LED bar has a much wider pattern in 'spot' than the IPF 'flood' anyway.
Purely my personal observations over lots of various configurations I've tried but hope it helps
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