I have bought 47 of these LED bulbs (9 watt cool white) so I am talking from experience.
Once you try the "white light", it will be hard to go back to the "yellow light". This bulb emits a true white light. Basically it is like standing inside a room and getting natural sunlight through a window at around the early afternoon. You see true colors and everything looks sharp.
Yellow light (usually titled "warm white" or "soft white") is the standard light from a light bulb. It is yellowish. This standard bulb gives everything a yellow tint. This yellow light makes items a little blurrier. Every halogen bulb emits yellow light.
In person, it is a wow difference between being in a room lit by white light as compared to yellow light. Most jewelers use this white light to light their stores to accentuate the jewelry.
To be truly happy with your purchase, you have to understand the "brightness affect". By brightness affect, I mean how bright a room feels when you turn on the light. For this brightness affect, this 9 watt LED bulb is equivalent to a 30 watt halogen bulb (not a 50 watt halogen bulb). This brightness feel is why some complain that these LED bulbs are half as bright as their halogen counterparts.
Personally, my rule of thumb is that I need two (2) 9 watt LED bulbs to replace one (1) 50 watt halogen bulb. Alternatively, a 9 watt LED bulb = a 30 watt halogen bulb. I had to buy new light fixtures anyway, so I planned for this difference. Thus, where I used to have a 5 socket 50 watt halogen bulbs light fixture, I bought a new light fixture with 9 sockets.
Do NOT get confused with the claims of "equivalent". They exaggerate the halogen equivalents. Look at how many LUMENS (LM) the LED bulb produces. LM is a measurement of brightness. A typical 50 watt halogen bulb produces around 800 LM. A typical 35 watt halogen bulb produces around 530 LM. This 9 watt LED bulb produces around 550 LM so that is why it is like a 35 watt halogen bulb.
My final recommendation, buy LED bulbs with at least 9 watts. The sub 9 watt LED bulbs just feel too dim for the average person.
Plus, buy LED bulbs that produce the white light. These white light bulbs are usually labeled "cool white" or "day light". The easiest way to tell is to look at the "color temperature" measured in Kelvins. You want the color temperature between 5,000K and 6,500K. By comparison, the yellow light LED has a color temperature of around 3,000K.
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