Turtle heat bulb

So after i got my heat lamp i needed a heat bulb. after looking around a pet store i found the 60watt(which my lamp is 60 watt) i found a bulb, but it was $15! so i looked around walmart in the out door lighting isle and found a plant light and plant bulbs. the plant light was $15 but since i already got a cheaper lamp that was the same watts i though it was a waste of money. They had two kinds of bulbs, One for daylight and one for night time. I decided to get the nigh time bulb since it was cheaper and so i didn't have to buy two bulbs for the same job. I found that it hardly produces light but produces a lot of heat(well the right amount anyways) and i think it was around $5-$10.

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