Low power high output spotlight bulbs?

SteNova said:

forget buying bulbs to fit into standard lamps

i've got 4 of these on my roof bar
10W CREE LED Work Light Fog light for Jeep SUV ATV Off-road Truck Waterproof | eBay
i opened and resealed them as they arent as waterproof as you expect

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richards123 said:

Basically been thinking of changing my light setup on my roof bar and a-bar and have been a fan of these new smd lights for many years which if anyone is interested are made mostly by Cree and they're cheap but bloody good.

im wondering if anyone has tried anything along the lines of these -
2x Pure White Car H3 3528 SMD 28 LED Head Light Super Bright Headlight Bulb Lamp | eBay

My thinking is that if they are as bright or brighter than the current ones and running on 10W then all 6 extra lights would use less power than one standard bulb but just wondering if anyone else has tried them.

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SteNova said:

forget buying bulbs to fit into standard lamps

i've got 4 of these on my roof bar
10W CREE LED Work Light Fog light for Jeep SUV ATV Off-road Truck Waterproof | eBay
i opened and resealed them as they arent as waterproof as you expect

Click to expand...

discomark10 said:

These cree led's must be an old design, I have a cree torch (think its 3w) its 1600 lumin, and these are only 800! you can get a normal 1w led with 900 lumin!

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timtheenchanteruk said:

wheres your 1600Lmn measured,

lmns and LEDs are like car stereo watts, can claim to be 30000000000W...

some manufacturers use the output of the chip, some the fixture, some form 1m some from the working distance. too many variables to use Lmn as an exact guide.

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brian47 said:

I've looked at some LEDs, both normal ones and Cree LEDs, and as far as I can see there just isn't the intensity of light at the correct focal point of the reflector in the light unit to be of any real use, unless the lighting unit has been specifically designed for LEDs; some new cars are now being sold with LED headlights.

Having said that, LEDs would seem to be adequate as FLOOD lights; an even light spread over a wide area with a short range projection, which would make them ideal as worklights but no good as a SPOT light where you need a fairly narrow beam of light projected over a longer distance.

The same would apply to fog lights where the reflector is as important to the flat beam pattern as the bulb.

In the case of both the fog and spot lights the illuminating device must be in the correct place in the lamp relative to the reflector to produce the correct beam pattern.

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timtheenchanteruk said:

I agree with this, I think the problem is, that an LED isnt a point source, its multi point, that 1cm square chip on a 10W flood is made up of (usualy) 12 (4x4) chips butted together, this means for a flood, with little focusing required, output is good, but for a spot, where the beam needs to be focused alot, losses in the lens mean output is poor.

they will get there, moving lights for stage are now around, with 80W LED replacing a 250 discharge lamp, and are pretty much identical apart from the colour temperature of the white.

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discomark10 said:

These cree led's must be an old design, I have a cree torch (think its 3w) its 1600 lumin, and these are only 800! you can get a normal 1w led with 900 lumin!

Click to expand...