LED H4's Beam pattern any good? Or totally screwed?

[SpannerMonkey]

Long story short, the highest wattage stator+flywheel combo I can get for my YX series engine is 100w. Thinking of looks, I went for some twin headlights (h4) and completely neglected the fact that 2x55w bulbs makes for a 110w draw.
I've spotted some 35w standard H4 bulbs, but I'm worried they'll be... well... dim??
I've noticed more and more LED bulbs on the scene and I'm curious as to whether the 35w LED H4's that are available will be any good in terms of not blinding every twat coming from the opposite direction.
Does the beam pattern hold up with LED's? or does it scatter out?
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My bike? A YX140 powered one-off Monkey Bike, something a little different!

[WD Forte]

I'd try one and see.
This one is only 6 quid so wont break the bank
https://www.ebay.co.uk/itm/12W-Motorcycle-Headlight-H4-800LM-White-COB-LED-Hi-Lo-Beam-Front-Light-Bulb-Lamp-/322392402024?hash=item4b1015a868:g:Hf0AAOSw44BYeEZ9

Don't be put off with the 12W, its the light output not watts you need
Traditional incandescent lights burn of 95% if the power as heat not light
I have a 20W Cree led security light outside which is very bright
and lights the whole back lane up better than my 55/65 bike headlight

The 12W one I indicated is compact and has it's own heat sink
Higher wattages will need more space for heat sinks and driver circuits
which has to be a consideration when using them on bikes where space may be limited.
Also I'd take your 100W with a pinch of salt, you want to work well inside that.
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bikers smell of wee

[Hahadumball]

£6 on an led headlight bulb?
might aswell buy one of those £3 things...

dont bother with led headlight bulbs unless youre spending £45-£70 for a bulb with at least 40w

ignore the ebay images on most led bulbs.. they lie

the drz has those cheap shitty led bulbs in the headlight and honestly... i could see more from the moonlight i had to wire up spotlights just to see more than a meter infront of myself
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Fin: no matter how much I look at It I can't understand what was going through my head, all I remember is going about 80 and redlining it to stop it seizing.
360 Deg... Five 1/4 turns. :- Teflon-Mike 18 Jan 2015

[Baggyman]

The problem is often the beam pattern. If the source of light is in a different place or has a different distribution to to the OEM bulb, you end up with a poor beam pattern - the bright bits are too bright and you get a sharp cut off so can see nothing out of the narrow direct beam.

The smart advice on LEDs is to get complete lights rather than aftermarket bulbs as then the reflectors are designed to match but that all costs money so maybe worth an experiment.
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Old fart
Baghira, modded GS1000 and the T150 I bought in 1978 when I was 21

[RhynoCZ]

OP, a 60/55W H4 emits upto 1650 Lumens. A 800lm LED won't be even as good as an cheap H4 bulb. Watts are not important here.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[ThatDippyTwat]

[Petemate]

[RhynoCZ]

[iooi]

[Petemate]

Thanks guys. I am sure it will be OK; firstly, the 35/35 must have been fitted by the PO, as the bike specifications indicate an H4 60/55. Also, the alternator and wiring are as per the 233cc Nighthawks, CB250s (non-Dream) CM250Cs etc etc. Only thing I think may be a concern may be the plastic reflector in my Chinese headlamp.... I will be checking it for heat following a run round the Oxford Ring Road, easy, 2 screws and less than half a minute to access.
Ta again.
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82 not out....1983 Honda LA250 Custom
2008 Saab 9-3 1.9 Tid 150 Vector Sport estate
2005 Stirling Eccles Topaz 2-berth

[Rogerborg]