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Here's a link to some info about LED efficiency; heat; etc. Ed

mag.ebmpapst.com/en/products/fans/what-t...led-headlights_8380/

Was going to edit my post above to add some things, but the edit feature has disappeared for that post.

Looking at the ebay listings for the bulbs in question, one says it's 40w and the other says it's 24w. So it seems they are not really following a "equivalent wattage" rating like home lighting has been using for CFL and LED lighting. The 40w one claims to be a lot brighter than the H4 in terms of lumens.

Interesting to see that H4 halogen bulbs are not allowed in U.S. cars. The bulbs U.S. cars use can meet H4 spec, but they have to also meet a higher spec called 9003/HB2. So that's why you can find replacement bulbs marked "H4" for cars in the parts store, but they also must be 9003 and/or HB2. Motorcycles can use H4, apparently.
candlepowerinc.com/pdfs/H4_9003.pdf

650ed wrote: Here's a link to some info about LED efficiency; heat; etc. Ed

mag.ebmpapst.com/en/products/fans/what-t...led-headlights_8380/

That is an interesting article, thanks.
Interestingly, in spite of the fact that an LED is so much more efficient than other bulbs, the article claims that an LED headlight s less than 30% efficient. The old incandescents that came on our bikes must be down in the single digits .

Lou,

I wonder if one seller is talking about power consumption and the other is talking about equivalent output?
Maybe it is like horsepower ratings on old muscle cars, two parts marketing, one part b.s.?

TexasKZ wrote: Lou,

I wonder if one seller is talking about power consumption and the other is talking about equivalent output?
Maybe it is like horsepower ratings on old muscle cars, two parts marketing, one part b.s.?

Where did you buy the light. I’d like one myself.

I am using this HID System on my GPz550's Stock Wiring with great success.

www.ddmtuning.com/Products/HIDBIKESINGLEHILO

Oh what a difference in night visibility I have both lo and high beam.